CVE-2025-14318
📋 TL;DR
M-Files Server versions before 25.12.15491.7 have an improper access control vulnerability that allows authenticated users to download files through M-Files Web using Web Companion even when the Print and Download Prevention module is enabled. This affects organizations using M-Files Server with the prevention module enabled to restrict file downloads.
💻 Affected Systems
- M-Files Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Sensitive documents protected by download prevention controls could be exfiltrated by authenticated users who should only have view-only access, potentially leading to data breaches.
Likely Case
Users with legitimate access to view documents could bypass intended download restrictions and save files locally, violating data protection policies.
If Mitigated
With proper access controls and monitoring, unauthorized downloads would be detected and prevented through additional security layers.
🎯 Exploit Status
Exploitation requires authenticated access to M-Files Web and knowledge of the Web Companion functionality. No public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 25.12.15491.7
Vendor Advisory: https://product.m-files.com/security-advisories/cve-2025-14318/
Restart Required: Yes
Instructions:
1. Download M-Files Server version 25.12.15491.7 or later from the M-Files customer portal. 2. Run the installer on the M-Files Server. 3. Follow the upgrade wizard. 4. Restart the M-Files Server service after installation completes.
🔧 Temporary Workarounds
Disable Web Companion
windowsTemporarily disable Web Companion functionality in M-Files Server configuration
Navigate to M-Files Admin > Server Configuration > Web Access > Disable Web Companion
Restrict Web Access
allLimit access to M-Files Web to only trusted users who require download capabilities
Configure firewall rules or application-level access controls to restrict M-Files Web access
🧯 If You Can't Patch
- Implement network segmentation to isolate M-Files Server from untrusted networks
- Enable detailed audit logging for all file access attempts and monitor for unauthorized download patterns
🔍 How to Verify
Check if Vulnerable:
Check M-Files Server version in M-Files Admin console under Server Management > About. If version is below 25.12.15491.7 and Print and Download Prevention module is enabled, the system is vulnerable.Check Version:
In M-Files Admin: Navigate to Server Management > About to view version informationVerify Fix Applied:
After upgrading to 25.12.15491.7 or later, verify that authenticated users cannot download files through Web Companion when Print and Download Prevention is enabled.📡 Detection & Monitoring
Log Indicators:
- Multiple file download attempts through Web Companion by users with download prevention restrictions
- Unusual file access patterns from users with view-only permissions
Network Indicators:
- Increased outbound traffic from M-Files Server during normal business hours
- File download requests bypassing normal authentication flows
SIEM Query:
source="m-files" AND (event_type="file_download" OR action="download") AND user_permission="view_only"