CVE-2025-11681: Critical Denial-of-Service Vulnerability in M-Files Server

Overview

CVE-2025-11681 is a security vulnerability affecting M-Files Server versions prior to 25.11.15392.1. This vulnerability allows an authenticated user to trigger a denial-of-service (DoS) condition by causing the core MFserver process to crash. While the CVSS score is currently unavailable, the potential impact on system availability necessitates immediate attention.

Technical Details

The specific technical details leading to the MFserver process crash are not fully disclosed in the initial advisory. However, the vulnerability stems from a flaw in how the M-Files Server handles certain inputs or requests from authenticated users. Exploitation of this vulnerability requires a valid user account within the M-Files environment. The exact mechanism triggering the crash will likely be revealed in further analysis by security researchers and M-Files themselves.

CVSS Analysis

Currently, a CVSS score is not available for CVE-2025-11681. However, given that it results in a denial-of-service condition, potentially disrupting critical document management workflows, it should be considered a serious issue. We will update this section as soon as a CVSS score is released.

Possible Impact

The exploitation of CVE-2025-11681 can lead to the following impacts:

• Denial of Service: The primary impact is the crashing of the MFserver process, rendering the M-Files Server unavailable. This disrupts document management operations for all users.
• Data Access Interruption: Users will be unable to access, modify, or add documents stored within the M-Files system until the server is restarted.
• Workflow Disruption: Business processes that rely on M-Files for document storage and retrieval will be interrupted.

Mitigation and Patch Steps

The recommended mitigation for CVE-2025-11681 is to upgrade your M-Files Server to version 25.11.15392.1 or later. This version contains the necessary fix to address the vulnerability.

1. Backup your M-Files environment: Before applying any updates, ensure you have a recent and valid backup of your M-Files server and database.
2. Download the latest version: Download the latest M-Files Server version (25.11.15392.1 or later) from the official M-Files website.
3. Apply the upgrade: Follow the official M-Files upgrade instructions provided with the new version.
4. Verify the installation: After the upgrade, thoroughly test the M-Files Server to ensure it is functioning correctly and that the vulnerability has been resolved.
5. Monitor system logs: Continuously monitor the M-Files Server logs for any unusual activity that might indicate attempted exploitation.

References

M-Files Security Advisory for CVE-2025-11681