CVE-2026-25108
📋 TL;DR
FileZen contains an OS command injection vulnerability that allows authenticated users to execute arbitrary operating system commands when the virus check option is enabled. This affects all FileZen installations with the vulnerable configuration, potentially giving attackers full system control.
💻 Affected Systems
- FileZen
📦 What is this software?
Filezen by Soliton
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands as the FileZen service account, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Attackers gain initial foothold on the server, install backdoors, exfiltrate sensitive files, or pivot to other systems in the network.
If Mitigated
Limited impact if proper network segmentation, least privilege, and monitoring are in place, though command execution would still be possible.
🎯 Exploit Status
Requires authenticated access but exploitation is straightforward once credentials are obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Latest security update from vendor
Vendor Advisory: https://www.soliton.co.jp/support/2026/006657.html
Restart Required: Yes
Instructions:
1. Download the latest security patch from Soliton support site. 2. Backup current configuration. 3. Apply the patch according to vendor instructions. 4. Restart FileZen service. 5. Verify the fix is applied.
🔧 Temporary Workarounds
Disable Virus Check Feature
allTemporarily disable the virus check option in FileZen configuration to prevent exploitation.
Edit FileZen configuration file and set virus_check_enabled = false
Network Segmentation
allRestrict access to FileZen administration interface to trusted IP addresses only.
Configure firewall rules to limit access to FileZen ports from authorized networks
🧯 If You Can't Patch
- Implement strict access controls and multi-factor authentication for FileZen users
- Deploy application-level firewall with command injection detection rules
🔍 How to Verify
Check if Vulnerable:
Check if virus check option is enabled in FileZen configuration and version is unpatched.Check Version:
Check FileZen admin interface or configuration files for version informationVerify Fix Applied:
Verify FileZen version is updated to latest security release and test command injection attempts are blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- HTTP requests containing shell metacharacters or command injection patterns to FileZen endpoints
SIEM Query:
source="filezen" AND (http_request CONTAINS "|" OR http_request CONTAINS ";" OR http_request CONTAINS "`" OR http_request CONTAINS "$")