Go/github.com/mattermost/mattermost-server 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 to 10.11.17 or later.
go get github.com/mattermost/mattermost-server@v11.6.1go get github.com/mattermost/mattermost-server@v11.5.5go get github.com/mattermost/mattermost-server@v10.11.17Affected
| introduced | fixed | last affected |
|---|---|---|
| 11.6.0 | 11.6.1 | - |
| 11.5.0 | 11.5.5 | - |
| 10.11.0 | 10.11.17 | - |
Fixed versions
| 11.6.1 | 11.5.5 | 10.11.17 |
Sources
- osv: GHSA-3vmp-whvv-5v9v
- 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 · modified · JSON