CVE-2025-31138
📋 TL;DR
This vulnerability in tarteaucitron.js allows attackers with direct access to website source code or CMS plugins to inject malicious CSS values for element dimensions. This enables clickjacking attacks where malicious UI elements can be overlaid on legitimate content, tricking users into unintended interactions. Websites using tarteaucitron.js versions before 1.20.1 are affected.
💻 Affected Systems
- tarteaucitron.js
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete website takeover via clickjacking, allowing attackers to trick users into performing unintended actions like transferring funds, changing passwords, or installing malware.
Likely Case
Limited clickjacking attacks targeting specific website functions, potentially leading to user data exposure or unauthorized actions.
If Mitigated
Minimal impact with proper input validation and Content Security Policy headers in place.
🎯 Exploit Status
Exploitation requires privileged access to modify website code. No public exploit code has been identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.20.1
Vendor Advisory: https://github.com/AmauriC/tarteaucitron.js/security/advisories/GHSA-7524-3396-fqv3
Restart Required: No
Instructions:
1. Update tarteaucitron.js to version 1.20.1 or later. 2. Replace the existing tarteaucitron.js file with the patched version. 3. Clear browser caches to ensure new version loads.
🔧 Temporary Workarounds
Input Validation Sanitization
allImplement server-side validation to sanitize width and height parameters before passing to tarteaucitron.js
Content Security Policy
allImplement strict Content Security Policy headers to prevent inline style injection
Content-Security-Policy: style-src 'self'
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized modifications to website source code
- Deploy web application firewall rules to detect and block CSS injection attempts
🔍 How to Verify
Check if Vulnerable:
Check if tarteaucitron.js version is below 1.20.1 in website source codeCheck Version:
grep -r 'tarteaucitron' /path/to/webroot | grep -i versionVerify Fix Applied:
Verify tarteaucitron.js file version shows 1.20.1 or higher in browser developer tools📡 Detection & Monitoring
Log Indicators:
- Unusual modifications to website source files
- CMS plugin configuration changes by unauthorized users
Network Indicators:
- Unexpected CSS injection patterns in HTTP requests
SIEM Query:
source="web_server" AND ("tarteaucitron" OR "cookie_banner") AND ("modify" OR "inject" OR "css")