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Denial-of-service vulnerability in M-Files Server versions before 26.1.15632.3 allows an authenticated attacker with vault administrator privileges to crash the M-Files Server process by calling a vulnerable API endpoint.

CVE-2026-0663 identifies a denial-of-service (DoS) vulnerability in M-Files Server, a document management system widely used in enterprise environments. The root cause is improper validation of syntactic correctness of input (CWE-1286) submitted to a specific API endpoint. An attacker who has authenticated access with vault administrator privileges can send crafted requests that exploit this flaw, causing the M-Files Server process to crash and become unavailable. This vulnerability affects all versions prior to 26.1.15632.3. The CVSS 4.0 base score is 6.9, reflecting a medium severity level due to the requirement for high privileges and lack of user interaction or scope change. The attack vector is network-based, and the vulnerability does not compromise confidentiality or integrity but impacts availability. No public exploits have been reported yet, but the vulnerability could disrupt business continuity by causing service outages. The flaw stems from insufficient input validation, which is a common security weakness that can be mitigated by rigorous input sanitization and validation in API implementations. The vulnerability was reserved and published in early 2026, with no patch links currently available, indicating that organizations should monitor vendor advisories closely for updates.

Detailed information about CVE-2026-0663: CWE-1286 Improper Validation of Syntactic Correctness of Input in M-Files Corporation M-Files Server affecting M-Files

CVE-2026-0663: CWE-1286 Improper Validation of Syntactic Correctness of Input in M-Files Corporation M-Files Server - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-0663: CWE-1286 Improper Validation of Syntactic Correctness of Input in M-Files Corporation M-Files Server

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