What is CVE-2026-28741?

CVE-2026-28741 is a medium-severity vulnerability in Mattermost, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.8/10. Published 2026-04-15.

How severe is CVE-2026-28741?

Medium severity. CVSS v3 base score is 6.8 out of 10.

CSRF in Mattermost

CVE-2026-28741

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…

Vulnerability class: CSRF (Cross-Site Request Forgery)

EPSS: 0.000 (5.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Mattermost — versions 10.11.0, 11.5.0, 11.4.0

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

MMSA-2026-00625 (vendor-advisory)

Frequently asked questions

What is CVE-2026-28741?: CVE-2026-28741 is a medium-severity vulnerability in Mattermost, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.8/10. Published 2026-04-15.
How severe is CVE-2026-28741?: Medium severity. CVSS v3 base score is 6.8 out of 10.