From 9124df1db2b90d9c2e69fa8575f4347f5486af8b Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Mon, 6 Oct 2025 19:38:56 +0000
Subject: [PATCH 1/3] Initial plan
From 649ddcac74aef4898b094da91b3fc6b6dc27949b Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Mon, 6 Oct 2025 19:44:20 +0000
Subject: [PATCH 2/3] Add XSS vulnerability analysis for TypeScript files
Co-authored-by: willum070 <2319656+willum070@users.noreply.github.com>
---
XSS_FINDINGS_SUMMARY.md | 130 ++++++++++++
XSS_VULNERABILITY_ANALYSIS.md | 384 ++++++++++++++++++++++++++++++++++
2 files changed, 514 insertions(+)
create mode 100644 XSS_FINDINGS_SUMMARY.md
create mode 100644 XSS_VULNERABILITY_ANALYSIS.md
diff --git a/XSS_FINDINGS_SUMMARY.md b/XSS_FINDINGS_SUMMARY.md
new file mode 100644
index 00000000..dfb188c5
--- /dev/null
+++ b/XSS_FINDINGS_SUMMARY.md
@@ -0,0 +1,130 @@
+# XSS Vulnerability Findings - Quick Reference
+
+## Files with XSS-Unsafe DOM Manipulation
+
+### 🔴 CRITICAL - Requires Immediate Fix (7 files)
+
+These files use `innerHTML` with dynamic, unsanitized data:
+
+1. **`samples/advanced-markers-html/index.ts`** (Line 48)
+ - Inserts property data (type, price, address, bed, bath, size) into HTML without escaping
+ - Example: `content.innerHTML = \`...\${property.address}...\``
+
+2. **`samples/3d-places/index.ts`** (Lines 29, 30, 34)
+ - Inserts Places API data (displayName, id, types) without sanitization
+ - Example: `element.innerHTML = "Name :" + place.displayName`
+
+3. **`samples/deckgl-kml/index.ts`** (Line 132)
+ - Inserts KML properties into tooltip HTML
+ - KML description field can contain arbitrary HTML
+ - Example: `tooltip.innerHTML = tooltipContent` with KML data
+
+4. **`samples/deckgl-kml-updated/index.ts`** (Line 156)
+ - Same vulnerability as #3
+
+5. **`samples/deckgl-heatmap/index.ts`** (Line 100)
+ - Inserts data source properties (ADDRESS, RACKS, SPACES) into tooltip
+ - Example: `tooltipContent += \`\${info.object.ADDRESS}\``
+
+6. **`samples/deckgl-polygon/index.ts`** (Line 110)
+ - Similar tooltip vulnerability with dynamic data
+
+7. **`samples/advanced-markers-graphics/index.ts`** (Line 93)
+ - Uses innerHTML for icon (currently hardcoded but unsafe pattern)
+ - Example: `icon.innerHTML = ''`
+
+### 🟡 MEDIUM - Should Be Refactored (4 files)
+
+These files use innerHTML with static content but follow unsafe patterns:
+
+8. **`samples/react-ui-kit-place-details/src/app.tsx`** (Line 44)
+9. **`samples/react-ui-kit-place-details-latlng/src/app.tsx`** (Line 45)
+10. **`samples/react-ui-kit-place-details-latlng-compact/src/app.tsx`** (Line 48)
+11. **`samples/react-ui-kit-place-details-compact/src/app.tsx`** (Line 47)
+ - All insert static Google Maps web component markup via innerHTML
+ - Currently safe but could be vulnerable if modified to include dynamic data
+
+### 🟢 SAFE - No Action Required (2 files)
+
+12. **`samples/weather-api-current-compact/simple-weather-widget.ts`** (Line 11)
+ - Uses innerHTML in Web Component constructor with Shadow DOM (standard pattern)
+ - All content is static CSS and HTML structure
+
+13. **`samples/ui-kit-customization/index.ts`** (Lines 290, 293, 307)
+ - Only uses innerHTML for clearing content (`innerHTML = ''`)
+ - Dynamic elements created with safe DOM methods
+
+### Additional Files Using innerHTML for Clearing (Safe)
+- `samples/react-ui-kit-search-nearby/src/app.tsx` (Lines 130, 141)
+- `samples/react-ui-kit-search-text/src/app.tsx` (Lines 134, 156)
+- React UI Kit samples listed above also use `innerHTML = ''` for clearing
+
+---
+
+## Quick Fix Guide
+
+### Pattern to Replace:
+```typescript
+// ❌ UNSAFE
+element.innerHTML = `${data.value}`;
+```
+
+### Safe Alternative:
+```typescript
+// ✅ SAFE
+const span = document.createElement('span');
+span.textContent = data.value;
+element.appendChild(span);
+```
+
+### For Multiple Children:
+```typescript
+// ❌ UNSAFE
+element.innerHTML = `
+ ${data.title}
+ ${data.body}
+`;
+```
+
+### Safe Alternative:
+```typescript
+// ✅ SAFE
+const title = document.createElement('div');
+title.className = 'title';
+title.textContent = data.title;
+
+const body = document.createElement('div');
+body.className = 'body';
+body.textContent = data.body;
+
+element.replaceChildren(title, body);
+```
+
+---
+
+## Priority Order for Fixes
+
+1. **Highest:** Files handling external data (KML files, user-uploaded content)
+ - `deckgl-kml/index.ts`, `deckgl-kml-updated/index.ts`
+
+2. **High:** Files displaying API data in tooltips
+ - `deckgl-heatmap/index.ts`, `deckgl-polygon/index.ts`
+
+3. **Medium:** Files displaying property/place data
+ - `advanced-markers-html/index.ts`, `3d-places/index.ts`
+
+4. **Low:** Files with static content but unsafe patterns
+ - React UI Kit samples, `advanced-markers-graphics/index.ts`
+
+---
+
+## Total Count
+
+- **Total files with innerHTML usage:** 15
+- **Critical vulnerabilities:** 7 files (46.7%)
+- **Medium risk:** 4 files (26.7%)
+- **Safe usage:** 4 files (26.7%)
+
+---
+
+Generated: $(date)
diff --git a/XSS_VULNERABILITY_ANALYSIS.md b/XSS_VULNERABILITY_ANALYSIS.md
new file mode 100644
index 00000000..3aa53684
--- /dev/null
+++ b/XSS_VULNERABILITY_ANALYSIS.md
@@ -0,0 +1,384 @@
+# XSS Vulnerability Analysis Report for js-api-samples Repository
+
+## Executive Summary
+This report identifies **9 TypeScript files** containing **XSS-unsafe DOM manipulation** patterns. These files use `innerHTML` to insert dynamic content without proper sanitization, which could lead to Cross-Site Scripting (XSS) vulnerabilities if user-controlled data flows into these operations.
+
+## Vulnerability Classification
+
+### 🔴 CRITICAL - Direct XSS Vulnerability (4 files)
+Files that use `innerHTML` with dynamic, potentially user-controlled data:
+
+### 🟡 MEDIUM - Potential XSS Risk (5 files)
+Files using `innerHTML` with hardcoded content but following unsafe patterns:
+
+### 🟢 LOW - Safe innerHTML Usage (6 files)
+Files using `innerHTML = ''` only for clearing content (safe pattern):
+
+---
+
+## Detailed Analysis
+
+### 🔴 CRITICAL VULNERABILITIES
+
+#### 1. `samples/advanced-markers-html/index.ts` (Line 48)
+**Risk Level:** CRITICAL
+**Issue:** Uses `innerHTML` with template literals containing unescaped dynamic data from `property` objects.
+
+```typescript
+content.innerHTML = `
+
+
+ ${property.type}
+
+
+
${property.price}
+
${property.address}
+
+
+ ${property.bed}
+
+
+ ${property.bath}
+
+
+ ${property.size} ft2
+
+
+
';
+```
+
+**Recommendation:** Use DOM methods like `textContent`, `setAttribute`, or a sanitization library.
+
+---
+
+#### 2. `samples/3d-places/index.ts` (Lines 29, 30, 34)
+**Risk Level:** CRITICAL
+**Issue:** Multiple `innerHTML` assignments with data from Places API without sanitization.
+
+```typescript
+document.getElementById("placeName").innerHTML = "Name :
" + place.displayName;
+document.getElementById("placeId").innerHTML = "Id :
" + place.id;
+document.getElementById("placeType").innerHTML = "Types :";
+
+for (const type of place.types) {
+ document.getElementById("placeType").innerHTML += "
" + type ;
+}
+```
+
+**Vulnerable Fields:**
+- `place.displayName` - Place name from Google Maps API
+- `place.id` - Place ID
+- `place.types` - Array of place type strings
+
+**Attack Vector:** While Google Maps API data is typically trusted, if the API ever returns unsanitized data or if the code is adapted to use user input, XSS is possible.
+
+**Additional Issue:** Using `+=` with `innerHTML` in a loop is inefficient and dangerous.
+
+**Recommendation:** Use `textContent` for all text insertion, or build DOM elements programmatically.
+
+---
+
+#### 3. `samples/deckgl-kml/index.ts` (Line 132)
+**Risk Level:** CRITICAL
+**Issue:** Builds HTML string with KML feature properties and assigns to `innerHTML`.
+
+```typescript
+let tooltipContent = `${object.properties.name || 'GeoJSON Feature'}
`;
+const kmlProperties = ['description', 'styleUrl', 'color', 'stroke', 'stroke-width', 'fill'];
+for (const key of kmlProperties) {
+ if (object.properties.hasOwnProperty(key) && object.properties[key] !== undefined) {
+ tooltipContent += `${key}: ${object.properties[key]}
`;
+ }
+}
+tooltip.innerHTML = tooltipContent;
+```
+
+**Vulnerable Fields:**
+- `object.properties.name` - KML feature name
+- `object.properties.description` - Can contain arbitrary HTML in KML files
+- `object.properties[key]` - Various KML properties
+
+**Attack Vector:** KML files can be created by users. The `description` field in KML commonly contains HTML markup and is a known XSS vector if not sanitized.
+
+**Example Attack:** A malicious KML file with:
+```xml
+<img src=x onerror="alert('XSS')">
+```
+
+**Recommendation:** Sanitize KML properties, especially `description`, or use `textContent`.
+
+---
+
+#### 4. `samples/deckgl-heatmap/index.ts` (Line 100)
+**Risk Level:** CRITICAL
+**Issue:** Builds tooltip HTML with data object properties.
+
+```typescript
+let tooltipContent = 'Bike Parking Info:
';
+if (info.object.ADDRESS !== undefined) {
+ tooltipContent += `Address: ${info.object.ADDRESS}
`;
+}
+if (info.object.RACKS !== undefined) {
+ tooltipContent += `Racks: ${info.object.RACKS}
`;
+}
+if (info.object.SPACES !== undefined) {
+ tooltipContent += `Spaces: ${info.object.SPACES}
`;
+}
+tooltip.innerHTML = tooltipContent;
+```
+
+**Vulnerable Fields:**
+- `info.object.ADDRESS` - Address string from data source
+- `info.object.RACKS` - Rack count
+- `info.object.SPACES` - Space count
+
+**Attack Vector:** If the data source contains malicious content in any field, XSS can occur.
+
+**Recommendation:** Use `textContent` or sanitize the data.
+
+---
+
+### 🟡 MEDIUM RISK
+
+#### 5. `samples/advanced-markers-graphics/index.ts` (Line 93)
+**Risk Level:** MEDIUM
+**Issue:** Hardcoded HTML string with Font Awesome icon.
+
+```typescript
+const icon = document.createElement('div');
+icon.innerHTML = '';
+```
+
+**Analysis:** Currently safe as content is hardcoded, but:
+- Establishes an unsafe pattern that could be copied
+- If modified to accept dynamic icon classes, becomes vulnerable
+
+**Recommendation:** Use `document.createElement('i')` and `classList.add()` instead.
+
+---
+
+#### 6-9. React UI Kit Samples (4 files) - Lines using static web component markup
+**Files:**
+- `samples/react-ui-kit-place-details/src/app.tsx` (Line 44)
+- `samples/react-ui-kit-place-details-latlng/src/app.tsx` (Line 45)
+- `samples/react-ui-kit-place-details-latlng-compact/src/app.tsx` (Line 48)
+- `samples/react-ui-kit-place-details-compact/src/app.tsx` (Line 47)
+
+**Risk Level:** MEDIUM
+**Issue:** Uses `innerHTML` to insert Google Maps web component markup.
+
+```typescript
+const contentConfig = document.createElement('gmp-place-content-config');
+contentConfig.innerHTML = `
+
+
+
+ ...
+`;
+```
+
+**Analysis:**
+- Content is static and hardcoded (safe)
+- However, pattern is XSS-unsafe if ever modified to include dynamic data
+- Could be refactored to use `appendChild` with `createElement`
+
+**Recommendation:** Refactor to create elements programmatically for consistency and safety.
+
+---
+
+#### 10. `samples/deckgl-kml-updated/index.ts` (Line 156)
+**Risk Level:** CRITICAL (Same as #3)
+Similar to `deckgl-kml/index.ts` with KML properties in tooltips.
+
+---
+
+#### 11. `samples/deckgl-polygon/index.ts` (Line 110)
+**Risk Level:** CRITICAL (Similar to #4)
+Similar pattern with dynamic data in tooltips.
+
+---
+
+### 🟢 LOW RISK (Safe Usage)
+
+The following files use `innerHTML = ''` only for clearing content, which is safe:
+- `samples/react-ui-kit-place-details/src/app.tsx` (Line 65)
+- `samples/react-ui-kit-place-details-latlng/src/app.tsx` (Line 66)
+- `samples/react-ui-kit-place-details-latlng-compact/src/app.tsx` (Line 60)
+- `samples/react-ui-kit-place-details-compact/src/app.tsx` (Line 59)
+- `samples/react-ui-kit-search-nearby/src/app.tsx` (Lines 130, 141)
+- `samples/react-ui-kit-search-text/src/app.tsx` (Lines 134, 156)
+
+**Pattern:**
+```typescript
+containerRef.current.innerHTML = ''; // Clear previous content
+placeSearchRef.current.innerHTML = '';
+```
+
+**Analysis:** Safe - clearing with empty string doesn't introduce XSS risk.
+
+**Note:** Alternative methods like `replaceChildren()` or `textContent = ''` could be considered.
+
+---
+
+#### 12. `samples/weather-api-current-compact/simple-weather-widget.ts` (Line 11)
+**Risk Level:** LOW (Safe)
+**Issue:** Uses `innerHTML` in Shadow DOM with static content (CSS and HTML structure).
+
+```typescript
+this.shadowRoot!.innerHTML = `
+
+
+
+
+`;
+```
+
+**Analysis:** Safe because:
+- Content is entirely static
+- Used in Web Component constructor with Shadow DOM
+- No dynamic data insertion
+- Follows common Web Component pattern
+
+**Recommendation:** No change needed - this is standard practice for Web Components.
+
+---
+
+#### 13. `samples/ui-kit-customization/index.ts` (Lines 290, 293, 307)
+**Risk Level:** MEDIUM
+**Issue:** Multiple `innerHTML` operations for building UI with some dynamic configuration.
+
+```typescript
+widgetContainer.innerHTML = ''; // Line 290 - Safe (clearing)
+placeElement.innerHTML = ''; // Line 293 - Safe (clearing)
+gmpContentConfig.innerHTML = ''; // Line 307 - Safe (clearing)
+```
+
+**Analysis:** Only uses `innerHTML` for clearing content (safe pattern). The dynamic element creation is done with `createElement` and `appendChild`, which is the correct approach.
+
+---
+
+## Summary Statistics
+
+| Risk Level | Count | Percentage |
+|------------|-------|------------|
+| 🔴 CRITICAL | 7 files | 46.7% |
+| 🟡 MEDIUM | 5 files | 33.3% |
+| 🟢 LOW (Safe) | 3 files | 20.0% |
+| **Total** | **15 files** | **100%** |
+
+---
+
+## Recommendations
+
+### Immediate Actions (Critical Fixes)
+
+1. **samples/advanced-markers-html/index.ts** - Refactor `buildContent()` to use DOM methods
+2. **samples/3d-places/index.ts** - Replace `innerHTML` with `textContent`
+3. **samples/deckgl-kml/index.ts** - Sanitize KML properties before display
+4. **samples/deckgl-kml-updated/index.ts** - Same as above
+5. **samples/deckgl-heatmap/index.ts** - Use `textContent` for data display
+6. **samples/deckgl-polygon/index.ts** - Same as above
+
+### General Best Practices
+
+1. **Use Safe DOM Methods:**
+ - `textContent` for text insertion
+ - `setAttribute()` for attributes
+ - `createElement()` + `appendChild()` for structure
+
+2. **Sanitization Libraries:**
+ - Consider DOMPurify for cases where HTML content is needed
+ - Sanitize any data from external sources (APIs, files, user input)
+
+3. **Content Security Policy:**
+ - Implement CSP headers to mitigate XSS impact
+ - Use `script-src 'self'` to prevent inline script execution
+
+4. **Code Review:**
+ - Flag all `innerHTML` usage in code reviews
+ - Prefer safe alternatives unless there's a specific need
+
+---
+
+## Example Refactoring
+
+### Before (Unsafe):
+```typescript
+element.innerHTML = `${data.name}`;
+```
+
+### After (Safe):
+```typescript
+const span = document.createElement('span');
+span.textContent = data.name;
+element.appendChild(span);
+```
+
+---
+
+## Testing Recommendations
+
+1. **Inject test strings** in data sources:
+ - ``
+ - ``
+ - `javascript:alert('XSS')`
+
+2. **Automated Security Scanning:**
+ - ESLint with security plugins
+ - SonarQube or similar SAST tools
+ - Snyk for dependency vulnerabilities
+
+3. **Manual Penetration Testing:**
+ - Test with malicious KML files
+ - Test with crafted API responses
+ - Test with special characters in data
+
+---
+
+## Conclusion
+
+The repository contains multiple XSS vulnerabilities, primarily in sample code that handles external data (KML files, Places API, data visualizations). While these are code samples and not production code, they could be copied by developers and introduce vulnerabilities in real applications.
+
+**Priority:** Address critical vulnerabilities in samples that handle user-provided or external data sources (KML files, tooltips with data).
+
+**Impact:** Medium to High - These samples serve as learning resources; vulnerable patterns could be propagated to production code.
+
+---
+
+## Files Requiring Changes
+
+### Critical Priority:
+1. ✅ `samples/advanced-markers-html/index.ts`
+2. ✅ `samples/3d-places/index.ts`
+3. ✅ `samples/deckgl-kml/index.ts`
+4. ✅ `samples/deckgl-kml-updated/index.ts`
+5. ✅ `samples/deckgl-heatmap/index.ts`
+6. ✅ `samples/deckgl-polygon/index.ts`
+
+### Medium Priority:
+7. ⚠️ `samples/advanced-markers-graphics/index.ts`
+8. ⚠️ `samples/react-ui-kit-place-details/src/app.tsx`
+9. ⚠️ `samples/react-ui-kit-place-details-latlng/src/app.tsx`
+10. ⚠️ `samples/react-ui-kit-place-details-latlng-compact/src/app.tsx`
+11. ⚠️ `samples/react-ui-kit-place-details-compact/src/app.tsx`
+
+### Low Priority (Documentation/Best Practices):
+12. 📝 Document safe patterns for clearing content
+13. 📝 Add ESLint rules to prevent future unsafe innerHTML usage
+
From 2b7fcbc47b54d03e6ef5ce33e41616a2eeeea47a Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Mon, 6 Oct 2025 19:45:36 +0000
Subject: [PATCH 3/3] Add CSV tracking file for XSS findings
Co-authored-by: willum070 <2319656+willum070@users.noreply.github.com>
---
XSS_FINDINGS.csv | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
create mode 100644 XSS_FINDINGS.csv
diff --git a/XSS_FINDINGS.csv b/XSS_FINDINGS.csv
new file mode 100644
index 00000000..5bcf2626
--- /dev/null
+++ b/XSS_FINDINGS.csv
@@ -0,0 +1,16 @@
+File,Line(s),Risk Level,Vulnerability Type,Vulnerable Data,Fix Priority,Notes
+samples/advanced-markers-html/index.ts,48,Critical,innerHTML with dynamic data,"property.type, property.price, property.address, property.bed, property.bath, property.size",Medium,Property data from objects - could be user-provided or from external API
+samples/3d-places/index.ts,"29, 30, 34",Critical,innerHTML with API data,"place.displayName, place.id, place.types[]",Medium,Places API data - trusted source but should still be sanitized
+samples/deckgl-kml/index.ts,132,Critical,innerHTML with KML data,"object.properties.name, object.properties.description, KML properties",Highest,KML files can be user-uploaded - description field commonly contains HTML
+samples/deckgl-kml-updated/index.ts,156,Critical,innerHTML with KML data,"object.properties.name, object.properties.description, KML properties",Highest,Same as deckgl-kml - user-controlled KML files are XSS vectors
+samples/deckgl-heatmap/index.ts,100,Critical,innerHTML with data properties,"info.object.ADDRESS, info.object.RACKS, info.object.SPACES",High,Data from external CSV/JSON source - could be compromised
+samples/deckgl-polygon/index.ts,110,Critical,innerHTML with data properties,Dynamic data object properties,High,Similar to deckgl-heatmap - external data in tooltips
+samples/advanced-markers-graphics/index.ts,93,Medium,innerHTML with static HTML,Hardcoded Font Awesome icon HTML,Low,Currently safe but establishes unsafe pattern
+samples/react-ui-kit-place-details/src/app.tsx,44,Medium,innerHTML with static web components,Google Maps web component markup (static),Low,Static content - safe but should use createElement for best practice
+samples/react-ui-kit-place-details-latlng/src/app.tsx,45,Medium,innerHTML with static web components,Google Maps web component markup (static),Low,Static content - safe but should use createElement for best practice
+samples/react-ui-kit-place-details-latlng-compact/src/app.tsx,48,Medium,innerHTML with static web components,Google Maps web component markup (static),Low,Static content - safe but should use createElement for best practice
+samples/react-ui-kit-place-details-compact/src/app.tsx,47,Medium,innerHTML with static web components,Google Maps web component markup (static),Low,Static content - safe but should use createElement for best practice
+samples/weather-api-current-compact/simple-weather-widget.ts,11,Safe,innerHTML in Web Component constructor,Static CSS and HTML structure in Shadow DOM,None,Standard Web Component pattern - safe
+samples/ui-kit-customization/index.ts,"290, 293, 307",Safe,innerHTML for clearing only,"Empty string ('') for clearing content",None,Safe pattern - only clearing content
+samples/react-ui-kit-search-nearby/src/app.tsx,"130, 141",Safe,innerHTML for clearing only,"Empty string ('') for clearing content",None,Safe pattern - only clearing content
+samples/react-ui-kit-search-text/src/app.tsx,"134, 156",Safe,innerHTML for clearing only,"Empty string ('') for clearing content",None,Safe pattern - only clearing content