CVE-2024-39926
📋 TL;DR
This CVE describes a stored cross-site scripting (XSS) or HTML injection vulnerability in Vaultwarden's admin dashboard. Authenticated attackers can inject malicious code that executes in administrators' browsers when viewing the dashboard. The default Content Security Policy (CSP) significantly reduces exploitation risk, but the vulnerability still exists.
💻 Affected Systems
- Vaultwarden (formerly Bitwarden_RS)
📦 What is this software?
Vaultwarden by Dani Garcia
⚠️ Risk & Real-World Impact
Worst Case
An authenticated malicious user could inject JavaScript that steals administrator session tokens, performs actions as the administrator, or compromises the entire Vaultwarden instance.
Likely Case
Limited HTML injection that disrupts dashboard functionality or displays misleading information, but JavaScript execution is blocked by default CSP.
If Mitigated
Only benign HTML rendering with no script execution due to CSP protections.
🎯 Exploit Status
Exploitation requires authenticated access to the admin dashboard. Default CSP blocks most script execution.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.32.0
Vendor Advisory: https://github.com/dani-garcia/vaultwarden/releases/tag/1.32.0
Restart Required: Yes
Instructions:
1. Backup your Vaultwarden data and configuration. 2. Update to Vaultwarden 1.32.0 or later. 3. Restart the Vaultwarden service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit admin dashboard access to trusted users only and implement strong authentication.
Enhance CSP
allStrengthen Content Security Policy headers to further restrict script execution.
🧯 If You Can't Patch
- Restrict admin dashboard access to specific IP addresses or VPN-only connections.
- Implement web application firewall (WAF) rules to detect and block XSS payloads.
🔍 How to Verify
Check if Vulnerable:
Check if running Vaultwarden version 1.30.3 or earlier. Review admin dashboard for any unexpected HTML content.Check Version:
docker exec vaultwarden vaultwarden --version (if using Docker) or check the Vaultwarden web interface footer.Verify Fix Applied:
Confirm Vaultwarden version is 1.32.0 or later. Test admin dashboard functionality remains intact.📡 Detection & Monitoring
Log Indicators:
- Unusual admin dashboard access patterns
- Suspicious POST requests to admin endpoints with HTML/script content
Network Indicators:
- HTTP requests containing script tags or JavaScript in admin dashboard parameters
SIEM Query:
source="vaultwarden" AND (uri_path="/admin/*" AND (request_body CONTAINS "<script>" OR request_body CONTAINS "javascript:"))