CVE-2026-28741
Mattermost doesn't validate CSRF tokens on an authentication endpoint
6.8
MEDIUM
CVSS 3.1
EPSS 0.02%
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.
How to fix CVE-2026-28741
To remediate CVE-2026-28741, upgrade the affected package to a fixed version below.
- —upgrade to 8.0.0-20260220133927-c29cf05d40f8 or later
Is CVE-2026-28741 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 8.0.0-20250721062209-4952acea88ce, < 8.0.0-20260220133927-c29cf05d40f8
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |