CVE-2026-28741

CSRF Protection Bypass Allows Updating a User's Authentication Method

Published Apr 15, 2026 CVSS 3.1 · 6.8 Medium EPSS < 1% KEV · Not listed
Description
Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625

Remediation

Vendor Solution

Update Mattermost to versions 10.11.13, 11.5.1, 11.4.3, 11.3.3 or higher.

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-m7cf-4gh2-v4qg Mattermost doesn't validate CSRF tokens on an authentication endpoint
References
History
Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost
Type Values Removed Values Added
Description Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625
Title CSRF Protection Bypass Allows Updating a User's Authentication Method
Weaknesses CWE-352
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Apr 15, 2026, 3:39 PM
Reserved
Mar 10, 2026, 1:45 PM
Status
Analyzed
Published
Apr 15, 2026, 11:16 AM
Modified
Jun 17, 2026, 10:28 AM