{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.17+incompatible or later.","affected":[{"fixed":"10.11.17+incompatible","introduced":"10.11.0+incompatible"},{"fixed":"11.5.5+incompatible","introduced":"11.5.0+incompatible"},{"fixed":"11.6.1+incompatible","introduced":"11.6.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-6046"],"ecosystem":"Go","epss":0.0019,"exploited":false,"fixed_versions":["10.11.17+incompatible","11.5.5+incompatible","11.6.1+incompatible"],"ghsa_id":"GHSA-3vmp-whvv-5v9v","id":"tcs_01M5KGSTZ25MY6M97DWNHX7H3S","modified_at":"2026-08-26T01:13:10.986219322Z","published_at":"2026-08-25T19:43:10Z","references":["https://osv.dev/vulnerability/GO-2026-6279","https://github.com/advisories/GHSA-3vmp-whvv-5v9v","https://nvd.nist.gov/vuln/detail/CVE-2026-6046","https://github.com/mattermost/mattermost/commit/3be10297c14d272f273d747af70728f9d03c60ec","https://github.com/mattermost/mattermost/commit/98f9778cec1e7f3d97b3d4692fb91f8e7b659972","https://github.com/mattermost/mattermost/commit/aba9339a24d4b287edd77377c19901d6e341bb96","https://github.com/mattermost/mattermost/commit/c79c3831061a0880c0962c7d567c9e24dd35f44c","https://github.com/mattermost/mattermost/commit/f706d1f01e6dfe62cab86c1d257f237daa78106a","https://github.com/mattermost/mattermost/pull/36064","https://github.com/mattermost/mattermost/pull/36305","https://github.com/mattermost/mattermost/pull/36317","https://github.com/mattermost/mattermost/pull/36318","https://github.com/mattermost/mattermost/pull/36320","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"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-6279","url":"https://osv.dev/vulnerability/GO-2026-6279"}],"summary":"Mattermost doesn't validate that a username returned during bot registration belongs to a bot account in github.com/mattermost/mattermost-server"}