Go/github.com/mattermost/mattermost/server/v8 CVE-2026-6046: medium 5.3, EPSS 0.30%

Mattermost doesn't validate that a username returned during bot registration belongs to a bot account

Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260428151657-c79c3831061a or later.

go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260428151657-c79c3831061a

Affected

Fixed versions

Sources

• osv: GHSA-3vmp-whvv-5v9v#Go/github.com/mattermost/mattermost/server/v8
• https://nvd.nist.gov/vuln/detail/CVE-2026-6046
• https://github.com/mattermost/mattermost/pull/36320
• https://github.com/mattermost/mattermost/pull/36318
• https://github.com/mattermost/mattermost/pull/36317
• https://github.com/mattermost/mattermost/pull/36305
• https://github.com/mattermost/mattermost/pull/36064
• https://github.com/mattermost/mattermost/commit/f706d1f01e6dfe62cab86c1d257f237daa78106a
• https://github.com/mattermost/mattermost/commit/c79c3831061a0880c0962c7d567c9e24dd35f44c
• https://github.com/mattermost/mattermost/commit/aba9339a24d4b287edd77377c19901d6e341bb96
• https://github.com/mattermost/mattermost/commit/98f9778cec1e7f3d97b3d4692fb91f8e7b659972
• https://github.com/mattermost/mattermost/commit/3be10297c14d272f273d747af70728f9d03c60ec
• https://github.com/mattermost/mattermost/releases/tag/v10.11.16
• https://github.com/mattermost/mattermost/releases/tag/v11.5.5
• https://github.com/mattermost/mattermost/releases/tag/v11.6.2
• https://github.com/mattermost/mattermost/releases/tag/v11.7.0
• https://mattermost.com/security-updates
• https://github.com/mattermost/mattermost

CVE-2026-6046 · published 2026-06-12T18:31:59Z · modified 2026-09-10T03:50:55.370444496Z · JSON