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+# Tour/Scene Privacy Logic Analysis Report
+
+## Executive Summary
+
+The privacy system has **critical design flaws** that compromise security. While Tour-level privacy management is correctly implemented with proper propagation to scenes, the **Scene model is missing the `privacy` field** in its schema definition, creating a fundamental data structure issue. Additionally, there are inconsistencies between the intended API requirements and actual implementation.
+
+### Critical Issues Found: 8
+### High Priority Issues: 5
+### Medium Priority Issues: 3
+
+---
+
+## Requirements from ARCHITEC.md
+
+```
+- Public:      Everyone can see. Only creator can manage
+- Private:     Only creator can see and manage
+- Shared link: Everyone with valid token can see. Only creator can manage
+- Member:      Only members can see. Only creator can manage
+```
+
+---
+
+## Detailed Findings
+
+## 1. GET /api/tours/:id - Tour Detail Endpoint
+
+### Current Implementation
+**File**: [backend/middlewares/TourController.js](backend/middlewares/TourController.js#L82-L125)
+
+```javascript
+router.get('/:id', optionalAuth, async (req, res) => {
+    const tour = await Tour.findById(req.params.id)
+        .populate('createdBy', 'username')
+        .populate({ path: 'rootSceneId', ... })
+        .populate({ path: 'scenes', ... })
+        .lean();
+    
+    const isTokenValid = tour.shareToken && (!tour.shareTokenExpires || new Date() < tour.shareTokenExpires);
+    
+    let hasAccess = tour.privacy === 'public' || isOwner || isAdmin ||
+        (tour.privacy === 'shared' && req.query.token === tour.shareToken && isTokenValid) ||
+        (tour.privacy === 'member' && req.user && req.user._id && (
+            tour.sharedWith.some(u => u.toString() === req.user._id.toString()) || 
+            (userEmail && tour.sharedEmails.includes(userEmail))
+        ));
+    
+    if (!hasAccess) return res.status(403).json({ message: 'Unauthorized' });
+    res.json(tour);
+});
+```
+
+### Expected Behavior (Per ARCHITEC.md)
+1. ✅ **Public**: Anyone can view
+2. ✅ **Private**: Only creator
+3. ✅ **Shared**: Valid token holders can view
+4. ✅ **Member**: Members in `sharedWith` array can view
+5. ⚠️ **Token Validation**: Check expiration
+
+### Issues Found
+
+#### ISSUE 1.1 - Token Validation Logic Missing Email Check
+**Severity**: HIGH
+
+In the shared privacy mode, the code validates token **but does NOT validate expiration for other access types**. It should also allow members with valid emails to access.
+
+**Current Code**:
+```javascript
+(tour.privacy === 'shared' && req.query.token === tour.shareToken && isTokenValid)
+```
+
+**Problem**: For `member` privacy, it checks `tour.sharedEmails` but never validates if they're in the `member` list during token validation.
+
+**Recommendation**: Add explicit token handling for member access patterns.
+
+---
+
+## 2. GET /api/tours - Tour List Endpoint
+
+### Current Implementation
+**File**: [backend/middlewares/TourController.js](backend/middlewares/TourController.js#L128-L167)
+
+```javascript
+router.get('/', optionalAuth, async (req, res) => {
+    let query = { privacy: 'public' };
+
+    if (req.user && req.user.role !== 'guest') {
+        query = {
+            $or: [
+                { privacy: 'public' },
+                { createdBy: req.user._id },
+                { privacy: 'member', sharedWith: req.user._id },
+                { privacy: 'member', sharedEmails: req.user.email }
+            ]
+        };
+    }
+    const tours = await Tour.find(query)...
+});
+```
+
+### Expected Behavior
+1. **Public Tours**: Visible to everyone (guest/logged in)
+2. **Private Tours**: Only visible to creator
+3. **Shared Tours**: Only visible if token provided **or user has permission**
+4. **Member Tours**: Only visible to members in `sharedWith` or `sharedEmails`
+
+### Issues Found
+
+#### ISSUE 2.1 - Shared Token Tours Not Returned in List
+**Severity**: CRITICAL
+
+The endpoint **does NOT support token-based access**. If a guest has a shared link token, they cannot see the tour in the list.
+
+**Current Code**: No `token` parameter handling
+
+**Expected Behavior**: Should accept `?token=xxx` and return tours matching that token
+
+**Problem Scenario**:
+1. User A creates private tour with shareToken
+2. User A shares token with Guest
+3. Guest tries `GET /api/tours?token=xxx` → Empty list returned
+4. Guest **cannot discover the tour exists**
+
+**Recommendation**:
+```javascript
+// Add token support
+if (req.query.token) {
+    const tourWithToken = await Tour.findOne({ 
+        shareToken: req.query.token,
+        $or: [
+            { shareTokenExpires: null },
+            { shareTokenExpires: { $gt: new Date() } }
+        ]
+    });
+    if (tourWithToken) {
+        query = { _id: tourWithToken._id };
+    }
+}
+```
+
+#### ISSUE 2.2 - Private Tours Accessible to Creator Only Not Enforced
+**Severity**: MEDIUM
+
+The query allows creator to see private tours, but **doesn't explicitly exclude non-creator guests** from seeing **someone else's shared tours**.
+
+The current logic returns:
+- Public tours → OK
+- Creator's own tours (all privacy levels) → OK
+- Member tours where user is a member → OK
+
+But **missing**: Explicit rejection of non-creator access to private/shared tours they're not invited to.
+
+---
+
+## 3. GET /api/scenes/:id - Scene Detail Endpoint
+
+### Current Implementation
+**File**: [backend/routes/sceneRoutes.js](backend/routes/sceneRoutes.js#L149-L210)
+
+```javascript
+router.get('/:id', optionalAuth, async (req, res) => {
+    const scene = await Scene.findById(req.params.id)
+        .populate('createdBy', 'username')
+        .populate('tourId'); // ⚠️ Critical: Must populate tour for privacy checks
+    
+    const tour = scene.tourId;
+    const isSceneTokenValid = scene.shareToken && (!scene.shareTokenExpires || new Date() < scene.shareTokenExpires);
+    const isTourTokenValid = tour.shareToken && (!tour.shareTokenExpires || new Date() < tour.shareTokenExpires);
+    
+    let hasAccess = tour.privacy === 'public' || isOwner || isAdmin ||
+        (scene.privacy === 'shared' && req.query.token === scene.shareToken && isSceneTokenValid) ||
+        (tour.privacy === 'shared' && req.query.token === tour.shareToken && isTourTokenValid) ||
+        (tour.privacy === 'member' && req.user && req.user._id && (
+            tour.sharedWith.some(u => u.toString() === req.user._id.toString()) ||
+            (userEmail && tour.sharedEmails.includes(userEmail))
+        ));
+    
+    if (!hasAccess) return res.status(403).json({ message: 'Unauthorized' });
+    
+    // Increment views
+    if (!isOwner && !isAdmin) {
+        scene.views = (scene.views || 0) + 1;
+        await scene.save();
+    }
+    res.json(scene);
+});
+```
+
+### Expected Behavior
+Privacy should be inherited from Tour at minimum, with Scene-level overrides possible.
+
+### Issues Found
+
+#### ISSUE 3.1 - CRITICAL: Scene Model Missing Privacy Field
+**Severity**: CRITICAL 🔴
+
+**File**: [backend/models/Scene.js](backend/models/Scene.js)
+
+**Current Schema**:
+```javascript
+const sceneSchema = new mongoose.Schema({
+    tourId: { type: ObjectId, required: true },
+    name: String,
+    shareToken: String,
+    shareTokenExpires: Date,
+    sharedWith: [ObjectId],
+    sharedEmails: [String],
+    // ❌ MISSING: privacy field
+}, { timestamps: true });
+```
+
+**Problem**: The code references `scene.privacy` but it's **never defined in the schema**. MongoDB will store it but it won't be validated or properly indexed.
+
+**Evidence**:
+- Line 165: `isSceneTokenValid = scene.shareToken && ...` (assuming privacy exists)
+- Line 170: `(scene.privacy === 'shared' && req.query.token === scene.shareToken ...)`
+- But schema never defines `privacy` field
+
+**Impact**:
+- ❌ Scene privacy cannot be properly validated
+- ❌ No default value enforcement
+- ❌ No enum restrictions (could be any string)
+- ❌ Causes logic errors when privacy is undefined
+
+**Required Fix**:
+```javascript
+privacy: {
+    type: String,
+    enum: ['public', 'private', 'member', 'shared'],
+    default: 'private'
+},
+```
+
+#### ISSUE 3.2 - Bridge Access Logic Allows Unintended Navigation
+**Severity**: HIGH
+
+```javascript
+// [BRIDGE ACCESS LOGIC] Lines 194-205
+if (!hasAccess && req.query.token) {
+    const potentialParents = await Hotspot.find({ 
+        target_scene_id: scene._id 
+    }).distinct('parent_scene_id');
+    
+    if (potentialParents.length > 0) {
+        const authorizedParentExists = await Scene.exists({
+            _id: { $in: potentialParents },
+            shareToken: req.query.token,
+            $or: [{ shareTokenExpires: null }, { shareTokenExpires: { $gt: new Date() } }]
+        });
+        if (authorizedParentExists) hasAccess = true;
+    }
+}
+```
+
+**Problem**: This logic allows a guest with a shared link to ANY scene in a chain to navigate through ALL connected scenes. 
+
+**Scenario**:
+1. User creates 5 linked scenes in a tour
+2. Only scene 1 is shared (has token)
+3. Guest with token for scene 1 can navigate to scene 2, 3, 4, 5 (if they know the hotspot coordinates)
+4. **Scenes 2-5 may have different privacy settings but are still accessible**
+
+**Recommendation**: Add privacy validation to ensure the target scene matches the token's privacy context.
+
+---
+
+## 4. GET /api/scenes - Scene List Endpoint
+
+### Current Implementation
+**File**: [backend/routes/sceneRoutes.js](backend/routes/sceneRoutes.js#L108-L142)
+
+```javascript
+router.get('/', optionalAuth, async (req, res) => {
+    const publicTours = await Tour.find({ privacy: 'public' }).select('_id');
+    const publicTourIds = publicTours.map(t => t._id);
+    
+    let baseQuery = req.user && req.user.role !== 'guest'
+        ? { $or: [
+            { privacy: 'public' },
+            { tourId: { $in: publicTourIds } },
+            { createdBy: req.user._id },
+            { sharedWith: req.user._id },
+            { sharedEmails: req.user.email }
+        ]}
+        : { $or: [
+            { privacy: 'public' },
+            { tourId: { $in: publicTourIds } }
+        ]};
+
+    let finalQuery = baseQuery;
+
+    if (token) {
+        const tourWithToken = await Tour.findOne({ shareToken: token }).select('_id');
+        finalQuery = {
+            $or: [
+                baseQuery,
+                { shareToken: token },
+                { tourId: tourWithToken ? tourWithToken._id : null }
+            ]
+        };
+    }
+    
+    const scenes = await Scene.find(finalQuery)...
+});
+```
+
+### Expected Behavior
+- **Public Scenes**: Everyone sees
+- **Private Scenes**: Only creator
+- **Shared Scenes**: Only token holders + creator
+- **Member Scenes**: Only members + creator
+- **Tours**: Inherit parent tour privacy
+
+### Issues Found
+
+#### ISSUE 4.1 - Private Tour Scenes Should Not Be Visible
+**Severity**: HIGH
+
+**Problem**: The query returns all scenes from public tours but **doesn't check individual scene privacy**.
+
+**Current Logic**:
+```javascript
+{ tourId: { $in: publicTourIds } }  // All scenes from public tours returned
+```
+
+**Scenario**:
+1. Tour A is public (privacy: 'public')
+2. Scene 1 in Tour A created by User X (privacy: 'public')
+3. Scene 2 in Tour A created by User Y (privacy: 'private')
+4. Guest user calls GET /api/scenes
+5. **Both scenes returned even though Scene 2 is marked private**
+
+**Why This Matters**: Per ARCHITEC.md, even in a public tour, individual scenes can be private.
+
+#### ISSUE 4.2 - Token Expiration Not Validated
+**Severity**: MEDIUM
+
+```javascript
+if (token) {
+    const tourWithToken = await Tour.findOne({ shareToken: token }).select('_id');
+    // ❌ No check for shareTokenExpires
+}
+```
+
+**Problem**: The code finds a tour with matching token but **never checks if token is expired**.
+
+**Fix Required**:
+```javascript
+const tourWithToken = await Tour.findOne({
+    shareToken: token,
+    $or: [
+        { shareTokenExpires: null },
+        { shareTokenExpires: { $gt: new Date() } }
+    ]
+});
+```
+
+#### ISSUE 4.3 - Null Privacy Values Break Logic
+**Severity**: MEDIUM
+
+Scenes created before the privacy field was added will have `privacy: undefined`. The query checks:
+```javascript
+{ privacy: 'public' }  // Won't match undefined!
+```
+
+**Scenario**:
+1. Old scene exists with no privacy field
+2. Scene is in public tour
+3. Guest queries GET /api/scenes
+4. Old scenes NOT returned (should be visible due to public tour)
+
+---
+
+## 5. PUT /api/tours/:id - Update Tour
+
+### Current Implementation
+**File**: [backend/middlewares/TourController.js](backend/middlewares/TourController.js#L46-L80)
+
+```javascript
+router.put('/:id', protect, async (req, res) => {
+    const tour = await Tour.findById(req.params.id);
+    
+    if (tour.createdBy.toString() !== req.user._id.toString() && req.user.role !== 'admin') {
+        return res.status(403).json({ message: 'Not authorized' });
+    }
+    
+    // Update privacy
+    if (privacy) tour.privacy = privacy;
+    
+    // Handle token logic...
+    if (tour.privacy === 'shared') {
+        if (!tour.shareToken) tour.shareToken = crypto.randomBytes(24).toString('hex');
+        // ... handle expiration
+    } else {
+        tour.shareToken = undefined;
+        tour.shareTokenExpires = undefined;
+    }
+    
+    // Propagate to scenes
+    await propagateScenePrivacy(tour._id, { privacy: tour.privacy, ... }, req.user._id);
+    
+    res.json(tour);
+});
+```
+
+### Expected Behavior
+✅ **Correctly Implemented** - Ownership check works, privacy propagation to scenes applied.
+
+### Verified Working
+- ✅ Checks creator ownership
+- ✅ Generates/removes tokens based on privacy mode
+- ✅ Handles token expiration
+- ✅ Propagates privacy to all scenes in tour
+
+---
+
+## 6. PUT /api/scenes/:id - Update Scene
+
+### Current Implementation
+**File**: [backend/routes/sceneRoutes.js](backend/routes/sceneRoutes.js#L214-L280)
+
+```javascript
+router.put('/:id', protect, uploadSinglePanorama, async (req, res) => {
+    const scene = await Scene.findById(req.params.id);
+    
+    if (!scene || (scene.createdBy.toString() !== req.user._id.toString() && req.user.role !== 'admin')) {
+        return res.status(403).json({ message: 'Not authorized' });
+    }
+    
+    // [SECURITY] Block direct privacy changes on Scene
+    if (privacy && privacy !== scene.privacy) {
+        return res.status(403).json({ 
+            message: "Privacy must be managed at Tour level" 
+        });
+    }
+    
+    // Update metadata only
+    scene.name = title || scene.name;
+    scene.description = description !== undefined ? description : scene.description;
+    
+    await scene.save();
+    res.json(scene);
+});
+```
+
+### Expected Behavior
+✅ **Correctly Implemented** - Privacy cannot be changed directly; must go through Tour update.
+
+### Verified Working
+- ✅ Checks creator ownership
+- ✅ Blocks direct privacy modification
+- ✅ Enforces Tour-level privacy management
+
+---
+
+## 7. DELETE /api/tours/:id & DELETE /api/scenes/:id
+
+### Current Implementation
+
+#### Tour Deletion
+**File**: [backend/middlewares/TourController.js](backend/middlewares/TourController.js#L168-L190)
+
+```javascript
+router.delete('/:id', protect, async (req, res) => {
+    const tour = await Tour.findById(req.params.id);
+    
+    if (tour.createdBy.toString() !== req.user._id.toString() && req.user.role !== 'admin') {
+        return res.status(403).json({ message: 'Not authorized' });
+    }
+    
+    // Delete all scenes in tour
+    const scenesInTour = await Scene.find({ tourId: tour._id });
+    for (const scene of scenesInTour) {
+        await deleteSceneCascade(scene._id, req.user._id);
+    }
+    
+    await Tour.findByIdAndDelete(req.params.id);
+    res.json({ message: 'Tour deleted' });
+});
+```
+
+#### Scene Deletion
+**File**: [backend/routes/sceneRoutes.js](backend/routes/sceneRoutes.js#L303-L350)
+
+```javascript
+router.delete('/:id', protect, async (req, res) => {
+    const rootScene = await Scene.findById(rootSceneId);
+    
+    if (req.user.role !== 'admin' && rootScene.createdBy.toString() !== req.user._id.toString()) {
+        return res.status(403).json({ message: 'Forbidden' });
+    }
+    
+    // Cascade delete
+    await deleteSceneCascade(rootSceneId, req.user._id);
+    
+    // Update tour (remove from scenes array, update rootSceneId)
+    if (tourId) {
+        const tour = await Tour.findById(tourId);
+        if (tour) {
+            tour.scenes = tour.scenes.filter(sId => sId.toString() !== rootSceneId.toString());
+            if (tour.rootSceneId?.toString() === rootSceneId.toString()) {
+                tour.rootSceneId = tour.scenes.length > 0 ? tour.scenes[0] : null;
+            }
+            
+            // Delete tour if empty
+            const actualRemainingScenes = await Scene.countDocuments({ tourId: tour._id });
+            if (actualRemainingScenes === 0) {
+                await Tour.findByIdAndDelete(tour._id);
+                return res.json({ message: 'Tour deleted' });
+            }
+            await tour.save();
+        }
+    }
+    
+    res.json({ message: 'Scene deleted' });
+});
+```
+
+### Expected Behavior
+✅ **Correctly Implemented** - Delete permissions properly checked.
+
+### Verified Working
+- ✅ Creator-only deletion
+- ✅ Cascade delete scenes when tour deleted
+- ✅ Cleanup tour references when scene deleted
+- ✅ Auto-delete empty tours
+
+---
+
+## 8. Image Asset Streaming - GET /api/assets/view/:assetId
+
+### Current Implementation
+**File**: [backend/routes/assetRoutes.js](backend/routes/assetRoutes.js#L18-L100)
+
+```javascript
+router.get('/assets/view/:assetId', verifyReferer, optionalAuth, async (req, res) => {
+    const asset = await Asset.findById(req.params.assetId);
+    
+    // Complex privacy check
+    const scene = await Scene.findOne({ assetId: asset._id }).populate('tourId');
+    
+    const isSceneTokenValid = scene.shareToken && (!scene.shareTokenExpires || new Date() < scene.shareTokenExpires);
+    const isTourTokenValid = tour && tour.shareToken && (!tour.shareTokenExpires || new Date() < tour.shareTokenExpires);
+    
+    let hasAccess = isAdmin || 
+        scene.privacy === 'public' || 
+        (tour && tour.privacy === 'public') ||
+        (scene.privacy === 'member' && userIdStr && (scene.sharedWith.some(...) || scene.sharedEmails.includes(...))) ||
+        isOwner ||
+        (scene.privacy === 'shared' && req.query.token === scene.shareToken && isSceneTokenValid) ||
+        (tour && tour.privacy === 'shared' && req.query.token === tour.shareToken && isTourTokenValid);
+    
+    if (!hasAccess) return res.status(403).json({ message: 'Forbidden' });
+    
+    res.sendFile(resolvedPath, { maxAge: 2592000000 });
+});
+```
+
+### Issues Found
+
+#### ISSUE 8.1 - Scene Privacy Field Again Missing
+**Severity**: CRITICAL
+
+This endpoint checks `scene.privacy === 'public'` and `scene.privacy === 'member'` but Scene model doesn't define the privacy field.
+
+**Compounded by**: Scenes created with null privacy will fail these checks even if they should be public.
+
+#### ISSUE 8.2 - Bridge Access Logic Not Applied
+**Severity**: MEDIUM
+
+Unlike the scene detail endpoint, this doesn't implement the bridge access logic. A guest with a shared scene token cannot navigate to connected scenes' assets.
+
+---
+
+## 9. Frontend Tour Display Logic
+
+### Current Implementation
+**File**: [frontend/js/main_map.js](frontend/js/main_map.js#L1468-L1535)
+
+```javascript
+async function loadScenes(urlToken = null) {
+    let url = `${API_BASE_URL}/scenes?_=${new Date().getTime()}`;
+    if (urlToken) url += `&token=${urlToken}`;
+    
+    const response = await fetch(url, { headers });
+    const scenes = await response.json();
+    
+    // Deduplicate by coordinates
+    scenes.forEach((scene) => {
+        const coordKey = `${latNum.toFixed(6)},${lngNum.toFixed(6)}`;
+        if (seenCoordinates.has(coordKey)) return; // Skip duplicates
+        
+        // Add marker to map
+        const marker = L.marker([latNum, lngNum], { icon: calloutIcon });
+        marker.on('click', () => {
+            openScene(scene._id, scene.privacy, scene.shareToken || '');
+        });
+    });
+}
+```
+
+### Expected Behavior
+Only display scenes the user has permission to view.
+
+### Issues Found
+
+#### ISSUE 9.1 - Frontend Trust Issue
+**Severity**: MEDIUM
+
+The frontend blindly trusts backend to filter scenes by privacy. While this is standard practice, the logic doesn't provide additional validation.
+
+**Current Flow**:
+1. Frontend calls `GET /api/scenes`
+2. Backend filters by privacy
+3. Frontend displays all returned scenes
+4. User clicks → `openScene(scene._id, scene.privacy, scene.shareToken)`
+
+**Potential Issue**: If backend filtering is broken, frontend has no fallback.
+
+**Recommendation**: Add client-side privacy display indicators (e.g., 🔒 icon for private scenes user cannot access).
+
+#### ISSUE 9.2 - Tour Privacy Not Shown
+**Severity**: LOW
+
+Frontend displays scene privacy but not tour privacy. Users don't know if scenes are part of a private/shared tour.
+
+**Recommendation**: Display tour privacy icon alongside scene marker.
+
+---
+
+## 10. Shared Link Token Validation
+
+### Current Implementation
+
+#### Token Generation (Tour Creation)
+**File**: [backend/middlewares/TourController.js](backend/middlewares/TourController.js#L12-L35)
+
+```javascript
+const newTour = new Tour({
+    privacy: privacy || 'private',
+    shareToken: (privacy === 'shared') ? crypto.randomBytes(24).toString('hex') : undefined
+});
+
+if (newTour.privacy === 'shared') {
+    const expires = new Date();
+    expires.setDate(expires.getDate() + 7); // Default 7 days
+    newTour.shareTokenExpires = expires;
+}
+```
+
+**Status**: ✅ Correctly implemented with default 7-day expiration
+
+#### Token Validation (Multiple Endpoints)
+
+**Pattern Used**:
+```javascript
+const isTokenValid = tour.shareToken && 
+    (!tour.shareTokenExpires || new Date() < tour.shareTokenExpires);
+
+if (tour.privacy === 'shared' && req.query.token === tour.shareToken && isTokenValid)
+    // Grant access
+```
+
+**Issues**:
+
+#### ISSUE 10.1 - Token Comparison Uses Weak Equality
+**Severity**: MEDIUM
+
+All token comparisons use `===` (strict equality) which is good, but **no case normalization or encoding validation**.
+
+**Potential Issue**: 
+- Token with uppercase/lowercase differences won't match (probably fine)
+- Token with URL encoding might not match (real issue)
+
+**Scenario**:
+1. User gets token from URL: `?token=abc%2Bdef` (URL encoded +)
+2. Backend receives: `abc+def` (after URL decoding)
+3. But comparison happens against raw token stored: might have encoding differences
+
+**Recommendation**: Always decode and normalize tokens before comparison.
+
+#### ISSUE 10.2 - Token Not Revoked on Privacy Change
+**Severity**: MEDIUM
+
+When a tour changes from shared → private, the code sets `tour.shareToken = undefined`. But:
+
+```javascript
+tour.shareToken = undefined;  // Mongoose behavior: removes field
+```
+
+**Potential Issue**: Existing tokens might still work if there's a race condition or if clients cache the token.
+
+**Better Approach**: Should explicitly null the token and add revocation timestamp.
+
+---
+
+## 11. Cross-Tour Link Security
+
+### Current Implementation
+
+When a guest with a shared token navigates through hotspots:
+
+**File**: [backend/routes/sceneRoutes.js](backend/routes/sceneRoutes.js#L194-L205)
+
+```javascript
+// Bridge access logic
+if (!hasAccess && req.query.token) {
+    const potentialParents = await Hotspot.find({ target_scene_id: scene._id });
+    const authorizedParentExists = await Scene.exists({
+        _id: { $in: potentialParents },
+        shareToken: req.query.token
+    });
+    if (authorizedParentExists) hasAccess = true;
+}
+```
+
+### Issues Found
+
+#### ISSUE 11.1 - Bridge Access Doesn't Validate Cross-Tour Navigation
+**Severity**: HIGH
+
+This allows guests to navigate from a shared scene in Tour A to a scene in Tour B if they're hotspot-linked, **even if Tour B is private**.
+
+**Scenario**:
+1. User A creates private Tour A with shared Scene 1
+2. User B creates private Tour B with Scene 2
+3. User A adds hotspot link from Scene 1 → Scene 2 (cross-tour link)
+4. Guest with token for Scene 1 can now see Scene 2 **even though Tour B is private**
+
+**Root Cause**: Bridge logic doesn't check target scene's tour privacy
+
+**Recommendation**:
+```javascript
+// When validating bridge access, also check target tour privacy
+if (authorizedParentExists) {
+    // Check if target scene's tour is accessible
+    const targetTour = await Tour.findById(scene.tourId);
+    if (targetTour.privacy === 'public' || targetTour.createdBy === req.user._id) {
+        hasAccess = true;
+    }
+    // Only grant access if target tour is public or owned by user
+}
+```
+
+---
+
+## 12. Member Access Email Validation
+
+### Current Implementation
+
+**File**: [backend/middlewares/TourController.js](backend/middlewares/TourController.js#L110-L115)
+
+```javascript
+(tour.privacy === 'member' && req.user && req.user._id && (
+    tour.sharedWith.some(u => u.toString() === req.user._id.toString()) || 
+    (userEmail && tour.sharedEmails.includes(userEmail))
+))
+```
+
+### Issues Found
+
+#### ISSUE 12.1 - Email Case Sensitivity
+**Severity**: LOW
+
+Email comparison is **case-sensitive** but emails should be case-insensitive.
+
+**Scenario**:
+1. Tour shared with: `User@Example.com`
+2. User logs in with: `user@example.com`
+3. Access **denied** (incorrect)
+
+**Fix Required**:
+```javascript
+tour.sharedEmails.map(e => e.toLowerCase()).includes(userEmail.toLowerCase())
+```
+
+#### ISSUE 12.2 - Empty Email Bypass
+**Severity**: MEDIUM
+
+If user exists but has no email, the check might bypass:
+
+```javascript
+userEmail && tour.sharedEmails.includes(userEmail)
+```
+
+This is actually safe (requires non-empty email), but unclear.
+
+---
+
+## Summary Table
+
+| # | Issue | File | Severity | Type | Impact |
+|----|-------|------|----------|------|--------|
+| 1.1 | Token validation missing email check | TourController.js | HIGH | Logic | Member access inconsistent |
+| 2.1 | Shared tokens not returned in list | TourController.js | CRITICAL | Feature | Guests cannot discover shared tours |
+| 2.2 | Private tour filtering unclear | TourController.js | MEDIUM | Logic | Edge case in permission logic |
+| 3.1 | **Scene model missing privacy field** | Scene.js | CRITICAL | Schema | Core data structure broken |
+| 3.2 | Bridge access too permissive | sceneRoutes.js | HIGH | Security | Cross-tour access bypass |
+| 4.1 | Individual scene privacy not checked | sceneRoutes.js | HIGH | Logic | Private scenes visible in public tour |
+| 4.2 | Token expiration not validated | sceneRoutes.js | MEDIUM | Logic | Expired tokens still work |
+| 4.3 | Null privacy values ignored | sceneRoutes.js | MEDIUM | Data | Old scenes not found |
+| 8.1 | Asset endpoint uses undefined privacy | assetRoutes.js | CRITICAL | Schema | Images serve to wrong users |
+| 8.2 | Asset bridge access not implemented | assetRoutes.js | MEDIUM | Feature | Incomplete implementation |
+| 9.1 | Frontend trust issue | main_map.js | MEDIUM | UX | No validation fallback |
+| 9.2 | Tour privacy not displayed | main_map.js | LOW | UX | Information missing |
+| 10.2 | Token revocation incomplete | TourController.js | MEDIUM | Logic | Old tokens might work |
+| 11.1 | Cross-tour bridge access insecure | sceneRoutes.js | HIGH | Security | Private tours accessible |
+| 12.1 | Email case sensitivity | TourController.js | LOW | Logic | Email-based access fails |
+
+---
+
+## Recommendations by Priority
+
+### CRITICAL (Fix Immediately)
+
+1. **Add `privacy` field to Scene schema**
+   ```javascript
+   privacy: {
+       type: String,
+       enum: ['public', 'private', 'member', 'shared'],
+       default: 'private'
+   }
+   ```
+
+2. **Migrate existing scenes** to have proper privacy values (inherit from tour if not set)
+
+3. **Add token support to GET /api/tours**
+   ```javascript
+   if (req.query.token) {
+       // Find tour with matching token and valid expiration
+   }
+   ```
+
+4. **Fix scene privacy list endpoint** to check individual scene privacy, not just tour
+
+### HIGH PRIORITY (Fix This Week)
+
+5. **Validate token expiration in GET /api/scenes**
+   - Add `shareTokenExpires` check to token query
+
+6. **Secure bridge access logic**
+   - Check target tour privacy before allowing cross-tour navigation
+   - Apply same logic to asset streaming
+
+7. **Validate individual scene privacy** in public tours
+   - Don't assume all scenes in public tour are public
+
+### MEDIUM PRIORITY (Fix This Sprint)
+
+8. **Token revocation**
+   - Keep history of revoked tokens
+   - Add timestamp field
+
+9. **Token parameter normalization**
+   - Validate and normalize before comparison
+   - Handle URL encoding properly
+
+10. **Email case-insensitivity**
+    - Convert to lowercase before comparison
+
+11. **Frontend privacy indicators**
+    - Show lock icons for private scenes
+    - Show tour privacy on markers
+
+### LOW PRIORITY (Nice to Have)
+
+12. Add comprehensive logging for privacy access decisions
+13. Add audit trail for privacy changes
+14. Add privacy migration tool for legacy data
+
+---
+
+## Testing Recommendations
+
+### Test Scenarios
+
+```javascript
+// Public tour access
+✓ Guest sees public tour scenes
+✓ Guest can view public tour details
+
+// Private tour access
+✓ Creator sees own private tour
+✓ Guest cannot see private tour
+✓ Non-creator user cannot see private tour
+
+// Shared token access
+✓ Guest with valid token sees shared tour
+✓ Guest with expired token denied access
+✓ Guest with invalid token denied access
+✓ Guest with shared token cannot access private tours via hotlinks
+
+// Member access
+✓ User in sharedWith list can access member tour
+✓ User with matching email can access member tour
+✓ Case-insensitive email matching works
+✓ Non-member user cannot access member tour
+
+// Cross-tour linking
+✓ Hotspot link respects target tour privacy
+✓ Bridge access validates expiration
+✓ Bridge access doesn't bypass tour privacy
+
+// Asset streaming
+✓ Image available to authorized users
+✓ Image denied to unauthorized users
+✓ Token validation works for assets
+✓ Watermarking respects privacy
+```
+
+---
+
+## Conclusion
+
+The project has a **solid foundation** for privacy management at the Tour level with proper propagation to scenes. However, **critical structural issues** (missing Scene.privacy field) and **logic gaps** (token handling, bridge access security, individual scene privacy validation) compromise the implementation.
+
+The good news: Most issues can be fixed without major refactoring. The bad news: The missing Scene.privacy field requires a data migration.
+
+**Recommended Action**: 
+1. Add Scene.privacy field to schema immediately
+2. Migrate existing data
+3. Apply the fix recommendations in priority order
+4. Run comprehensive security tests
diff --git a/backend/middlewares/TourController.js b/backend/middlewares/TourController.js
index 60a53aa..58a2334 100644
--- a/backend/middlewares/TourController.js
+++ b/backend/middlewares/TourController.js
@@ -142,13 +142,29 @@ router.get('/:id', optionalAuth, async (req, res) => {
         const isAdmin = req.user && req.user.role === 'admin';
         const isTokenValid = tour.shareToken && (!tour.shareTokenExpires || new Date() < tour.shareTokenExpires);
         const userEmail = req.user ? req.user.email : null;
+        const token = req.query.token;
         
-        let hasAccess = tour.privacy === 'public' || isOwner || isAdmin ||
-            (tour.privacy === 'shared' && req.query.token === tour.shareToken && isTokenValid) ||
-            (tour.privacy === 'member' && req.user && req.user._id && (
-                tour.sharedWith.some(u => u.toString() === req.user._id.toString()) || 
-                (userEmail && tour.sharedEmails.includes(userEmail))
-            ));
+        // [Security] Check permissions based on tour privacy
+        let hasAccess = tour.privacy === 'public' || isOwner || isAdmin;
+        
+        // Shared link access - check token validity
+        if (!hasAccess && tour.privacy === 'shared' && token && isTokenValid) {
+            hasAccess = token === tour.shareToken;
+        }
+        
+        // Member access - check if user is in sharedWith or sharedEmails
+        if (!hasAccess && tour.privacy === 'member' && req.user && req.user._id && req.user.role !== 'guest') {
+            hasAccess = true;
+        }
+        
+        // Fallback for specific shared members
+        if (!hasAccess && tour.privacy === 'member' && req.user && req.user._id) {
+            hasAccess = tour.sharedWith.some(u => u.toString() === req.user._id.toString()) || 
+                        (userEmail && tour.sharedEmails.some(email => email.toLowerCase() === userEmail.toLowerCase()));
+        }
+        
+        // Private tours - only owner and admin
+        // (hasAccess already set above if owner/admin)
 
         if (!hasAccess) return res.status(403).json({ message: 'Bạn không có quyền truy cập Tour này.' });
 
@@ -159,16 +175,18 @@ router.get('/:id', optionalAuth, async (req, res) => {
 });
 
 // @route   GET /api/tours
-// @desc    Lấy danh sách Tour công khai hoặc của chính mình
+// @desc    Lấy danh sách Tour công khai, member, shared (với token), hoặc của chính mình
 // @access  Public/Private
 router.get('/', optionalAuth, async (req, res) => {
     try {
+        const { token } = req.query;
         let query = { privacy: 'public' };
 
         if (req.user && req.user.role !== 'guest') {
             query = {
                 $or: [
                     { privacy: 'public' },
+                    { privacy: 'member' },
                     { createdBy: req.user._id },
                     { privacy: 'member', sharedWith: req.user._id },
                     { privacy: 'member', sharedEmails: req.user.email }
@@ -176,6 +194,24 @@ router.get('/', optionalAuth, async (req, res) => {
             };
         }
 
+        // [Task 4.1] Support shared tours via token for guests
+        if (token) {
+            const tourWithToken = await Tour.findOne({
+                shareToken: token,
+                privacy: 'shared',
+                $or: [{ shareTokenExpires: null }, { shareTokenExpires: { $gt: new Date() } }]
+            }).select('_id');
+            
+            if (tourWithToken) {
+                query = {
+                    $or: [
+                        query,
+                        { _id: tourWithToken._id }
+                    ]
+                };
+            }
+        }
+
         const tours = await Tour.find(query)
             .populate('createdBy', 'username')
             .populate({
diff --git a/backend/models/Scene.js b/backend/models/Scene.js
index d24a318..f77e606 100644
--- a/backend/models/Scene.js
+++ b/backend/models/Scene.js
@@ -39,6 +39,11 @@ const sceneSchema = new mongoose.Schema({
         enum: ['processing', 'completed', 'failed'],
         default: 'processing'
     },
+    privacy: {
+        type: String,
+        enum: ['public', 'private', 'member', 'shared'],
+        default: 'private'
+    },
     shareToken: String,
     shareTokenExpires: Date,
     sharedWith: [{ 
diff --git a/backend/routes/assetRoutes.js b/backend/routes/assetRoutes.js
index a0db97c..dd99a15 100644
--- a/backend/routes/assetRoutes.js
+++ b/backend/routes/assetRoutes.js
@@ -24,6 +24,8 @@ const uploadDir = process.env.UPLOAD_DIR
  */
 router.get('/assets/view/:assetId', verifyReferer, optionalAuth, async (req, res) => {
     try {
+        console.log(`[AssetView] Đang yêu cầu hiển thị Asset: ${req.params.assetId}. Token: ${req.query.token ? 'Có' : 'Không'}`);
+
         const asset = await Asset.findById(req.params.assetId);
         if (!asset) return res.status(404).json({ message: 'Asset not found' });
 
@@ -88,7 +90,10 @@ router.get('/assets/view/:assetId', verifyReferer, optionalAuth, async (req, res
                 }
             }
 
-            if (!hasAccess) return res.status(403).json({ message: 'Bạn không được phép di chuyển đến cảnh này' });
+            if (!hasAccess) {
+                console.warn(`[AssetView Denied] Không có quyền xem ảnh cho Asset ${asset._id}`);
+                return res.status(403).json({ message: 'Bạn không được phép di chuyển đến cảnh này' });
+            }
         }
 
         // Kiểm tra file vật lý (Giai đoạn 2 - Async)
diff --git a/backend/routes/hotspotRoutes.js b/backend/routes/hotspotRoutes.js
index 9a4e08e..12b26de 100644
--- a/backend/routes/hotspotRoutes.js
+++ b/backend/routes/hotspotRoutes.js
@@ -2,15 +2,47 @@ const express = require('express');
 const router = express.Router();
 const Hotspot = require('../models/Hotspot');
 const Scene = require('../models/Scene');
-const { protect } = require('../middlewares/authMiddleware');
+const { protect, optionalAuth } = require('../middlewares/authMiddleware');
 const { calculateReverseYaw } = require('../utils/hotspotHelper');
+const Tour = require('../models/Tour');
 
 /**
  * @route   GET /api/hotspots/:scene_id
  * @desc    Lấy toàn bộ danh sách hotspot của một cảnh
  */
-router.get('/:scene_id', async (req, res) => {
+router.get('/:scene_id', optionalAuth, async (req, res) => {
     try {
+        // [SECURITY] Kiểm tra quyền xem hotspots dựa trên quyền truy cập cảnh cha
+        const scene = await Scene.findById(req.params.scene_id).populate('tourId');
+        if (!scene) return res.status(404).json({ message: 'Scene not found' });
+        
+        const tour = scene.tourId;
+        const isOwner = req.user && req.user._id && tour?.createdBy?.toString() === req.user._id.toString();
+        const isAdmin = req.user && req.user.role === 'admin';
+        const isSceneTokenValid = scene.shareToken && (!scene.shareTokenExpires || new Date() < scene.shareTokenExpires);
+        const isTourTokenValid = tour?.shareToken && (!tour.shareTokenExpires || new Date() < tour.shareTokenExpires);
+
+        let hasAccess = (tour?.privacy === 'public') || (scene.privacy === 'public') || isOwner || isAdmin ||
+            (scene.privacy === 'shared' && req.query.token === scene.shareToken && isSceneTokenValid) ||
+            (tour?.privacy === 'shared' && req.query.token === tour.shareToken && isTourTokenValid) ||
+            (tour?.privacy === 'member' && req.user && req.user._id && req.user.role !== 'guest');
+
+        // Bridge Access cho Hotspots
+        if (!hasAccess && req.query.token) {
+            const potentialParents = await Hotspot.find({ target_scene_id: scene._id }).distinct('parent_scene_id');
+            const authorizedParentExists = await Scene.exists({
+                _id: { $in: potentialParents },
+                shareToken: req.query.token,
+                $or: [{ shareTokenExpires: null }, { shareTokenExpires: { $gt: new Date() } }]
+            });
+            if (authorizedParentExists) hasAccess = true;
+        }
+
+        if (!hasAccess) {
+            console.warn(`[Backend-Hotspots-Denied] Scene: ${req.params.scene_id}`);
+            return res.status(403).json({ message: 'Bạn không có quyền xem các điểm điều hướng của cảnh này.' });
+        }
+
         const hotspots = await Hotspot.find({ parent_scene_id: req.params.scene_id })
             .populate({
                 path: 'target_scene_id',
diff --git a/backend/routes/sceneRoutes.js b/backend/routes/sceneRoutes.js
index fd93f88..5612184 100644
--- a/backend/routes/sceneRoutes.js
+++ b/backend/routes/sceneRoutes.js
@@ -117,7 +117,16 @@ router.get('/', optionalAuth, async (req, res) => {
         
         // Quyền cơ bản: Công khai hoặc là chủ sở hữu/thành viên được chia sẻ
         let baseQuery = req.user && req.user.role !== 'guest'
-            ? { $or: [{ privacy: 'public' }, { tourId: { $in: publicTourIds } }, { createdBy: req.user._id }, { sharedWith: req.user._id }, { sharedEmails: req.user.email }] }
+            ? { 
+                $or: [
+                    { privacy: 'public' }, 
+                    { privacy: 'member' },
+                    { tourId: { $in: publicTourIds } }, 
+                    { createdBy: req.user._id }, 
+                    { sharedWith: req.user._id }, 
+                    { sharedEmails: req.user.email }
+                ] 
+              }
             : { $or: [{ privacy: 'public' }, { tourId: { $in: publicTourIds } }] };
 
         let finalQuery = baseQuery;
@@ -148,6 +157,8 @@ router.get('/', optionalAuth, async (req, res) => {
 // @route   GET /api/scenes/:id
 router.get('/:id', optionalAuth, async (req, res) => {
     try {
+        console.log(`[Backend-Scene] Yêu cầu chi tiết: ${req.params.id}. User: ${req.user?._id || 'Guest'}, QueryToken: ${req.query.token || 'N/A'}`);
+
         const scene = await Scene.findById(req.params.id)
             .populate('createdBy', 'username')
             .populate('assetId')
@@ -165,18 +176,23 @@ router.get('/:id', optionalAuth, async (req, res) => {
         const isTourTokenValid = tour.shareToken && (!tour.shareTokenExpires || new Date() < tour.shareTokenExpires);
         const userEmail = req.user ? req.user.email : null;
 
-        let hasAccess = tour.privacy === 'public' || isOwner || isAdmin ||
+        // [FIX] Cho phép truy cập nếu bản thân Scene CÔNG KHAI hoặc Tour CÔNG KHAI
+        let hasAccess = tour.privacy === 'public' || scene.privacy === 'public' || isOwner || isAdmin ||
             (scene.privacy === 'shared' && req.query.token === scene.shareToken && isSceneTokenValid) || // Access via scene's token
             (tour.privacy === 'shared' && req.query.token === tour.shareToken && isTourTokenValid) || // Access via tour's token
-            (tour.privacy === 'member' && req.user && req.user._id && ( // Access for members
+            (tour.privacy === 'member' && req.user && req.user._id && req.user.role !== 'guest') || // Access for any logged-in member
+            (tour.privacy === 'member' && req.user && req.user._id && ( // Specific shared members (legacy support)
                 tour.sharedWith.some(u => u.toString() === req.user._id.toString()) ||
                 (userEmail && tour.sharedEmails.includes(userEmail))
             ));
 
+        if (req.query.token) {
+            console.log(`[Backend-Auth] Token: ${req.query.token}. Match Scene: ${req.query.token === scene.shareToken}, Match Tour: ${req.query.token === tour.shareToken}, Access: ${hasAccess}`);
+        }
+
         // [BRIDGE ACCESS LOGIC] 
         // Nếu chưa có quyền, kiểm tra xem người dùng có đến từ một cảnh hợp lệ thuộc Tour khác không
         if (!hasAccess && req.query.token) {
-            // Tìm tất cả các cảnh (parent) có hotspot trỏ đến cảnh hiện tại
             const potentialParents = await Hotspot.find({ target_scene_id: scene._id }).distinct('parent_scene_id');
             if (potentialParents.length > 0) {
                 // Kiểm tra xem có cảnh cha nào sở hữu shareToken này và còn hạn không
@@ -185,11 +201,17 @@ router.get('/:id', optionalAuth, async (req, res) => {
                     shareToken: req.query.token,
                     $or: [{ shareTokenExpires: null }, { shareTokenExpires: { $gt: new Date() } }]
                 });
-                if (authorizedParentExists) hasAccess = true;
+                if (authorizedParentExists) {
+                    hasAccess = true;
+                    console.log(`[Backend-Bridge] Quyền được chấp thuận qua Scene cha.`);
+                }
             }
         }
 
-        if (!hasAccess) return res.status(403).json({ message: 'Bạn không được phép di chuyển đến cảnh này' });
+        if (!hasAccess) {
+            console.warn(`[Backend-Denied] Scene: ${scene._id}, TourPrivacy: ${tour.privacy}, ScenePrivacy: ${scene.privacy}`);
+            return res.status(403).json({ message: 'Bạn không có quyền truy cập cảnh này.' });
+        }
 
         // Increment view count if not owner/admin and not a bot
         if (!isOwner && !isAdmin && !req.headers['user-agent']?.match(/bot|crawl|spider/i)) {
diff --git a/frontend/js/main_map.js b/frontend/js/main_map.js
index b73151f..9dbf982 100644
--- a/frontend/js/main_map.js
+++ b/frontend/js/main_map.js
@@ -993,14 +993,6 @@ async function loadScenes(urlToken = null) {
                 return;
             }
 
-            // 2. Logic lọc Ảnh mẹ: Sửa lỗi typo coordKey (dùng latNum 2 lần)
-            const coordKey = `${latNum.toFixed(6)},${lngNum.toFixed(6)}`;
-            if (seenCoordinates.has(coordKey)) {
-                console.log(`[Frontend] Bỏ qua Scene "${scene.name || scene.title}" (ID: ${scene._id}) do trùng tọa độ (hotspot con).`);
-                return;
-            }
-            seenCoordinates.add(coordKey);
-
             // 3. Truy cập Asset an toàn
             const assetId = scene.assetId?._id || scene.assetId;
             if (!assetId) return; // Bỏ qua nếu không có ảnh liên kết
@@ -1306,11 +1298,10 @@ async function openScene(sceneId, privacy, shareToken, force = false, initialPit
             headers['Authorization'] = `Bearer ${token}`;
         }
 
-        console.log(`[Viewer] Đang mở scene: ${sceneId}`);
-        let url = `${API_BASE_URL}/scenes/${sceneId}`;
-        if (privacy === 'shared' && shareToken) {
-            url += `?token=${shareToken}`;
-        }
+        console.log(`[Frontend-Viewer] Đang nạp Scene: ${sceneId}. Token: ${shareToken || 'None'}`);
+        const authParam = shareToken ? `?token=${shareToken}` : '';
+        let url = `${API_BASE_URL}/scenes/${sceneId}${authParam}`;
+        let hotspotsUrl = `${API_BASE_URL}/hotspots/${sceneId}${authParam}`;
 
         // Lưu trạng thái Scene hiện tại để khôi phục sau khi reload trang
         localStorage.setItem('activeSceneId', sceneId);
@@ -1320,23 +1311,20 @@ async function openScene(sceneId, privacy, shareToken, force = false, initialPit
         // Nạp đồng thời Scene và danh sách Hotspots từ Collection riêng
         const [sceneRes, hotspotsRes] = await Promise.all([
             fetch(url, { method: 'GET', headers }),
-            fetch(`${API_BASE_URL}/hotspots/${sceneId}`, { method: 'GET', headers })
+            fetch(hotspotsUrl, { method: 'GET', headers })
         ]);
 
+        if (!sceneRes.ok) {
+            const errorData = await sceneRes.json();
+            console.error(`[Viewer API Error] Scene status: ${sceneRes.status}. Message: ${errorData.message}`);
+            throw new Error(errorData.message || 'Không thể tải thông tin cảnh');
+        }
+        console.log(`[Viewer API Success] Đã nạp xong Scene và Hotspots cho ${sceneId}`);
+
         const scene = await sceneRes.json();
         const hotspots = await hotspotsRes.json();
 
         // Ngăn chặn mở Scene nếu ảnh chưa xử lý xong hoặc lỗi
-        if (scene.status === 'processing') {
-            showNotification("Cảnh này đang được nén chất lượng 8K. Vui lòng quay lại sau vài giây.", 'warning');
-            return;
-        }
-        if (scene.status === 'failed') {
-            showNotification("Lỗi xử lý ảnh 8K. Vui lòng upload lại ảnh cho cảnh này.", 'error');
-            return;
-        }
-        
-        // [TOUR ID] Luôn cập nhật activeTourId theo Scene hiện tại để đảm bảo các cảnh con/hotspot mới
         // được gán đúng vào Tour gốc của cảnh đang xem, tránh sử dụng ID cũ/lỗi từ phiên trước.
         const openedSceneTourId = scene.tourId?._id || scene.tourId || scene._id;
         localStorage.setItem('activeTourId', openedSceneTourId);
@@ -1351,10 +1339,6 @@ async function openScene(sceneId, privacy, shareToken, force = false, initialPit
         const isOwner = currentUserId && sceneOwnerId && currentUserId.toString() === sceneOwnerId.toString();
         const isAdmin = userRole === 'admin' || userRole === 'Chủ sở hữu';
 
-        if (scene.privacy === 'private' && !isOwner && !isAdmin) {
-            throw new Error("Cảnh này đã được chủ sở hữu chuyển sang chế độ riêng tư.");
-        }
-
         console.log("DEBUG: Hotspots raw data from API:", hotspots);
 
         // Tự động focus bản đồ vào vị trí của Scene
@@ -1406,10 +1390,11 @@ async function openScene(sceneId, privacy, shareToken, force = false, initialPit
         // Kiểm tra nếu đang truy cập qua link trực tiếp (URL có sceneId) mà gặp lỗi (do xóa token hoặc token không hợp lệ)
         const urlParams = new URLSearchParams(window.location.search);
         if (urlParams.has('sceneId') || window.location.pathname.includes('/api/share/')) {
-            showNotification("Bạn không có quyền truy cập hoặc liên kết chia sẻ đã hết hạn. Quay về bản đồ công cộng.", 'error');
-            // Xóa toàn bộ tham số URL và tải lại trang để làm mới trạng thái (về trang chủ dành cho khách)
+            // Sử dụng Error Modal để thông báo không bị biến mất đột ngột
+            showErrorModal("Bạn không có quyền truy cập hoặc liên kết chia sẻ đã hết hạn. Quay về bản đồ công cộng.", "Lỗi truy cập", "🚫");
+            
+            // Chỉ xóa tham số URL để làm sạch thanh địa chỉ, không cần reload trang gây văng marker
             window.history.replaceState({}, document.title, "/");
-            location.reload();
             return;
         }