CVE-2026-27611
📋 TL;DR
This vulnerability in FileBrowser Quantum allows unauthorized access to password-protected shared files. Anyone with a share link can bypass password protection and download files directly. This affects all users who share files with passwords in vulnerable versions.
💻 Affected Systems
- FileBrowser Quantum
📦 What is this software?
Filebrowser Quantum by Gtsteffaniak
Filebrowser Quantum by Gtsteffaniak
Filebrowser Quantum by Gtsteffaniak
⚠️ Risk & Real-World Impact
Worst Case
Sensitive files shared with password protection are exposed to unauthorized parties, potentially leading to data breaches, privacy violations, or intellectual property theft.
Likely Case
Unauthorized users access password-protected shared files, compromising confidentiality of sensitive documents, media, or other protected content.
If Mitigated
With proper access controls and monitoring, impact is limited to specific shared files rather than entire systems, but confidentiality of those files is still compromised.
🎯 Exploit Status
Exploitation requires only the share link, which could be obtained through various means. No authentication or special tools needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.1.3-stable or 1.2.6-beta
Vendor Advisory: https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-8vrh-3pm2-v4v6
Restart Required: Yes
Instructions:
1. Backup your configuration and data. 2. Stop the FileBrowser service. 3. Update to version 1.1.3-stable or 1.2.6-beta. 4. Restart the service. 5. Verify the fix by testing password-protected file sharing.
🔧 Temporary Workarounds
Disable file sharing
allTemporarily disable all file sharing functionality to prevent exploitation
Edit configuration to disable sharing features
Use external authentication
allImplement external authentication mechanisms instead of built-in password protection
Configure external auth providers
🧯 If You Can't Patch
- Disable all password-protected file sharing immediately
- Monitor access logs for unauthorized download attempts on shared files
🔍 How to Verify
Check if Vulnerable:
Test by creating a password-protected file share and attempting to access the download link without entering the passwordCheck Version:
filebrowser versionVerify Fix Applied:
After patching, test password-protected file sharing to confirm password is required for download📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to shared file endpoints
- Downloads of password-protected files without authentication logs
Network Indicators:
- Direct file downloads from share links without preceding authentication requests
SIEM Query:
source="filebrowser" AND (event="file_download" AND NOT event="password_verified")