CVE-2025-52995
📋 TL;DR
CVE-2025-52995 is an improper command allowlist vulnerability in File Browser that allows authenticated users to execute unauthorized shell commands. This could lead to arbitrary command execution, file system access, and database compromise. All File Browser instances prior to version 2.33.10 are affected.
💻 Affected Systems
- File Browser
📦 What is this software?
Filebrowser by Filebrowser
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise allowing attacker to execute arbitrary commands, access all files including sensitive data, and potentially pivot to other systems.
Likely Case
Unauthorized access to files managed by File Browser, including database files, configuration files, and user uploads.
If Mitigated
Limited impact if proper network segmentation and least privilege principles are implemented, restricting the attacker to the application's scope.
🎯 Exploit Status
Exploitation requires authenticated access to File Browser. The vulnerability is in the allowlist logic, allowing bypass of intended restrictions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.33.10
Vendor Advisory: https://github.com/filebrowser/filebrowser/security/advisories/GHSA-w7qc-6grj-w7r8
Restart Required: Yes
Instructions:
1. Stop File Browser service. 2. Backup configuration and data. 3. Update to version 2.33.10 using your package manager or manual download. 4. Restart File Browser service. 5. Verify functionality.
🔧 Temporary Workarounds
Disable command execution features
allRemove or disable all shell command execution capabilities in File Browser configuration.
Edit configuration file to remove command execution settings or set allowlist to empty
Network isolation
linuxRestrict network access to File Browser instances using firewall rules.
iptables -A INPUT -p tcp --dport [filebrowser-port] -s [trusted-networks] -j ACCEPT
iptables -A INPUT -p tcp --dport [filebrowser-port] -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to limit who can access File Browser
- Apply principle of least privilege to File Browser service account and container permissions
🔍 How to Verify
Check if Vulnerable:
Check File Browser version. If version is below 2.33.10, the system is vulnerable.Check Version:
filebrowser versionVerify Fix Applied:
Verify File Browser version is 2.33.10 or higher and test command execution features to ensure proper allowlist enforcement.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns
- Access to files outside normal scope
- Database file access from unexpected users
Network Indicators:
- Unusual outbound connections from File Browser server
- Traffic patterns indicating file exfiltration
SIEM Query:
source="filebrowser.log" AND (command_execution OR shell_command) AND NOT allowed_command