CVE-2025-63872
📋 TL;DR
DeepSeek V3.2 contains an XSS vulnerability where malicious JavaScript can be executed through SVG content generated by the model. This affects users who view or interact with SVG content from DeepSeek V3.2, potentially allowing attackers to steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- DeepSeek Chat
📦 What is this software?
Deepseek by Deepseek
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal user session tokens, perform account takeover, redirect users to malicious sites, or execute arbitrary actions in the context of the victim's authenticated session.
Likely Case
Session hijacking, credential theft, or unauthorized actions performed within the user's DeepSeek session.
If Mitigated
Limited impact if proper Content Security Policy (CSP) headers are implemented and SVG sanitization is enforced.
🎯 Exploit Status
Exploitation requires user interaction with malicious SVG content, but the technical barrier is low given public proof-of-concept details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Monitor DeepSeek official channels for security updates. 2. Upgrade to a patched version when available. 3. Apply workarounds in the meantime.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to restrict script execution from untrusted sources.
Add 'Content-Security-Policy: script-src 'self'' to HTTP headers
Disable SVG Generation
allTemporarily disable SVG content generation in DeepSeek configuration.
Set SVG generation to disabled in application configuration
🧯 If You Can't Patch
- Implement strict input validation and output encoding for SVG content
- Use web application firewalls (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Test if SVG content containing JavaScript executes when rendered in the application.Check Version:
Check DeepSeek version in application settings or via API endpointVerify Fix Applied:
Verify that SVG content is properly sanitized and JavaScript does not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual SVG generation requests
- JavaScript execution in SVG content logs
Network Indicators:
- HTTP requests with malicious SVG payloads
- Unexpected external script loads from SVG content
SIEM Query:
search 'svg' AND 'javascript' in web application logs