CVE-2026-28741

CSRF Protection Bypass Allows Updating a User's Authentication Method

State: Published
Severity: 6.8 Medium
Published: Apr 15, 2026
Updated: Apr 15, 2026
Reserved: Mar 10, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	6.8 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N	Mattermost

Weaknesses

CWE-352 Cross-Site Request Forgery (CSRF)

Affected Products

Product	Versions
MattermostMattermost	10.11.0 through 10.11.12Affected 11.5.0 through 11.5.0Affected 11.4.0 through 11.4.2Affected 11.3.0 through 11.3.2Affected 10.11.13Not affected 11.5.1Not affected 11.4.3Not affected 11.3.3Not affected

References

MMSA-2026-00625vendor-advisory

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