What is the CVSS score of CVE-2026-0663?

CVE-2026-0663 has a CVSS 3.1 base score of 4.9 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

Which versions of M Files Server are affected by CVE-2026-0663?

Organizations using M-Files Server should be aware of moderate risk from CVE-2026-0663 rated CVSS 4.9. Exploitation could compromise the security of affected deployments.

How to fix or mitigate CVE-2026-0663?

Within 30 days: Identify affected systems running M-Files Server and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

M Files Server CVE-2026-0663

MEDIUM

Improper Validation of Syntactic Correctness of Input (CWE-1286)

2026-01-21 security@m-files.com

Denial Of Service M Files Server

4.9

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

4.9 MEDIUM

AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 21, 2026 - 11:15 nvd

MEDIUM 4.9

DescriptionCVE.org

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.

AnalysisAI

M-Files Server before version 26.1.15632.3 can be crashed by authenticated administrators with vault privileges through an unsafe API endpoint, resulting in service disruption. This denial-of-service vulnerability requires high-level privileges and network access, making it a limited-scope threat to organizations running vulnerable versions. No patch is currently available.

Technical ContextAI

Affects M-Files Server. 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.