GHSA-m7cf-4gh2-v4qg
Mattermost doesn't validate CSRF tokens on an authentication endpoint
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | >= 8.0.0-20250721062209-4952acea88ce, < 8.0.0-20260220133927-c29cf05d40f8 | 8.0.0-20260220133927-c29cf05d40f8 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.5.0-rc1, < 11.5.0 | 11.5.0 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.4.0-rc1, < 11.4.3 | 11.4.3 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.3.0-rc1, < 11.3.3 | 11.3.3 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.