CVE-2025-11681 is a vulnerability classified under CWE-400 (Uncontrolled Resource Consumption) affecting M-Files Server, a widely used enterprise content management system. The flaw exists in versions prior to 25.11.15392.1, 25.2 LTS SR2, and 25.8 LTS SR2, where an authenticated user with low privileges can trigger a denial-of-service (DoS) condition by causing the MFserver process to crash. The vulnerability arises from the server's inability to properly manage resource allocation under certain conditions, leading to exhaustion of critical resources and subsequent process termination. The CVSS 4.0 base score is 7.1 (high), reflecting that the attack vector is network-based (AV:N), requires low attack complexity (AC:L), no user interaction (UI:N), and only low privileges (PR:L) are needed. The impact is primarily on availability (VA:H), with no confidentiality or integrity impact. No known exploits have been reported in the wild, but the vulnerability is publicly disclosed and should be considered a significant risk for organizations relying on M-Files Server for document management and workflow automation. The lack of patch links suggests that vendors may be in the process of releasing updates or that users should upgrade to the specified fixed versions.

For European organizations, the primary impact is service disruption due to denial-of-service attacks that can crash the M-Files Server process. This can lead to downtime of critical document management services, affecting business operations, compliance workflows, and collaboration. Organizations in sectors such as finance, legal, healthcare, and government, which rely heavily on M-Files for secure document handling, may face operational delays and potential regulatory non-compliance if service availability is compromised. The requirement for authentication limits exploitation to insiders or compromised accounts, but the low privilege needed increases the risk from malicious or careless users. Additionally, the disruption could be leveraged as part of a broader attack campaign to distract or degrade organizational defenses. Given the high CVSS score and the critical role of M-Files in enterprise environments, the impact on availability is significant and could result in financial and reputational damage.

1. Immediately verify the M-Files Server version in use and plan an upgrade to versions 25.11.15392.1, 25.2 LTS SR2, or 25.8 LTS SR2 as soon as vendor patches or updates become available. 2. Restrict and monitor user authentication to the M-Files Server, enforcing strict access controls and multi-factor authentication to reduce the risk of unauthorized or malicious use of valid credentials. 3. Implement network segmentation and firewall rules to limit access to the M-Files Server to trusted internal networks and users only. 4. Monitor server resource utilization metrics closely for unusual spikes or patterns indicative of resource exhaustion attempts. 5. Conduct regular audits of user accounts and permissions to ensure least privilege principles are enforced. 6. Prepare incident response plans specifically addressing denial-of-service scenarios impacting document management systems. 7. Engage with M-Files support or vendor channels to receive timely updates and advisories related to this vulnerability. 8. Consider deploying application-layer protections or rate limiting to mitigate potential abuse of server resources by authenticated users.