EUVD-2026-15806

| CVE-2026-27659 MEDIUM
2026-03-25 Mattermost GHSA-rmhw-c3xr-m3xx
4.6
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

4
Patch Released
Apr 01, 2026 - 02:30 nvd
Patch available
Analysis Generated
Mar 25, 2026 - 16:47 vuln.today
EUVD ID Assigned
Mar 25, 2026 - 16:47 euvd
EUVD-2026-15806
CVE Published
Mar 25, 2026 - 16:33 nvd
MEDIUM 4.6

Tags

CSRF

Description

Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to properly validate CSRF tokens in the /api/v4/access_control_policies/{policy_id}/activate endpoint, which allows an attacker to trick an admin into changing access control policy active status via a crafted request.. Mattermost Advisory ID: MMSA-2026-00578

Analysis

A Cross-Site Request Forgery (CSRF) vulnerability exists in Mattermost's access control policy activation endpoint due to improper CSRF token validation. Authenticated attackers can exploit this to trick administrators into activating or deactivating access control policies via crafted requests, potentially altering security posture. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify anti-CSRF tokens are enforced.

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Priority Score

23
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +23
POC: 0

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EUVD-2026-15806 vulnerability details – vuln.today
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