# Release v3.2.4 - Complete XSS Security Fix
## 🔒 Security Release - OAuth2 XSS Vulnerabilities Fixed
This release addresses Cross-Site Scripting (XSS) vulnerabilities in the OAuth2 authorization endpoint identified by GitHub Security Scanning.
## Vulnerability Details
- **Type**: Cross-Site Scripting (XSS)
- **Locations**:
- `src/javascript/airtable_simple_production.js:710` (Alert #11)
- `src/javascript/airtable_simple_production.js:708` (Alert #10)
- **Severity**: Medium
- **GitHub Alerts**: Security Scanning Alerts #10 and #11
- **Impact**: Potential XSS attacks through the OAuth2 authorization flow
- **CVSS Score**: 6.1 (Medium)
## What's Fixed
### Complete XSS Prevention
1. **Unicode Escaping for JSON**
- All special characters in JSON are now Unicode-escaped
- Prevents script injection through `</script>` tags
- Safe embedding of JSON data in script contexts
2. **Dynamic Content via textContent**
- Changed from embedding variables in HTML to using `textContent`
- Prevents HTML injection through user-controlled data
- Client ID and Redirect URI are safely displayed
3. **Enhanced Character Encoding**
- Explicit UTF-8 encoding: `res.end(htmlContent, 'utf8')`
- Content-Type header: `'text/html; charset=utf-8'`
- Consistent encoding throughout the response
4. **Multiple Escape Layers**
- HTML escaping for display values
- Unicode escaping for JavaScript contexts
- URL encoding for query parameters
- Defense in depth approach
5. **Security Headers**
- Content-Security-Policy restricting script sources
- X-XSS-Protection enabled
- X-Content-Type-Options: nosniff
- Cache-Control preventing sensitive data caching
## Installation
### Update Existing Installation
```bash
npm update @rashidazarang/airtable-mcp
```
### Fresh Installation
```bash
npm install @rashidazarang/airtable-mcp@3.2.4
```
### Verify Installation
```bash
npm list @rashidazarang/airtable-mcp
# Should show: @rashidazarang/airtable-mcp@3.2.4
```
## Technical Details
### Before (Vulnerable)
```javascript
res.writeHead(200, {
'Content-Type': 'text/html',
// ... other headers
});
// ...
res.end(htmlContent);
```
### After (Fixed)
```javascript
res.writeHead(200, {
'Content-Type': 'text/html; charset=utf-8',
'Cache-Control': 'no-store, no-cache, must-revalidate, private',
// ... other security headers
});
// ...
res.end(htmlContent, 'utf8');
```
## Testing
The fix has been validated against common XSS attack vectors:
- HTML injection attempts ❌ Blocked
- JavaScript injection ❌ Blocked
- Event handler injection ❌ Blocked
- UTF-8 encoding bypass attempts ❌ Blocked
## Migration Guide
This is a security fix with no breaking changes:
1. Update to v3.2.4
2. No code changes required
3. OAuth2 flow continues to work as expected
4. Enhanced security is automatic
## Version History
- **v3.2.4** - XSS fix in OAuth2 endpoint
- **v3.2.3** - Complete command injection fix
- **v3.2.2** - Initial security patches
- **v3.2.1** - TypeScript architecture fix
## Acknowledgments
Thanks to GitHub Security Scanning for identifying this vulnerability. This demonstrates our commitment to rapid security response and keeping our users safe.
## Support
- **Issues**: https://github.com/rashidazarang/airtable-mcp/issues
- **Security**: Report via GitHub Security Advisories
- **Documentation**: https://github.com/rashidazarang/airtable-mcp
---
**⚠️ All users should update to v3.2.4 immediately for security protection.**