What is the CVSS score of CVE-2025-27538?

CVE-2025-27538 has a CVSS 3.1 base score of 2.2 (Low). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.2%.

Which versions of Mattermost Server are affected by CVE-2025-27538?

CVE-2025-27538 is a low-severity vulnerability (CVSS 2.2). The limited severity suggests constrained impact, typically requiring specific conditions or local access for exploitation.. A patch is available.

How to fix or mitigate CVE-2025-27538?

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

Mattermost Server CVE-2025-27538

LOW

Missing Authentication for Critical Function (CWE-306)

2025-04-16 responsibledisclosure@mattermost.com

Authentication Bypass Mattermost Server

2.2

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

2.2 LOW

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 28, 2026 - 18:37 vuln.today

CVE Published

Apr 16, 2025 - 08:15 nvd

LOW 2.2

DescriptionCVE.org

Mattermost versions 10.5.x <= 10.5.1, 9.11.x <= 9.11.9 fail to enforce MFA checks in PUT /api/v4/users/user-id/mfa when the requesting user differs from the target user ID, which allows users with edit_other_users permission to activate or deactivate MFA for other users, even if those users have not set up MFA.

AnalysisAI

Mattermost versions 10.5.x <= 10.5.1, 9.11.x <= 9.11.9 fail to enforce MFA checks in PUT /api/v4/users/user-id/mfa when the requesting user differs from the target user ID, which allows users with. Rated low severity (CVSS 2.2), this vulnerability is remotely exploitable. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Missing Authentication for Critical Function (CWE-306), which allows attackers to access critical functionality without authentication. Mattermost versions 10.5.x <= 10.5.1, 9.11.x <= 9.11.9 fail to enforce MFA checks in PUT /api/v4/users/user-id/mfa when the requesting user differs from the target user ID, which allows users with edit_other_users permission to activate or deactivate MFA for other users, even if those users have not set up MFA. Affected products include: Mattermost Mattermost Server.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Require authentication for all sensitive operations, implement defense in depth.