{"action":"Upgrade github.com/mattermost/mattermost-server to 8.0.0-20260316060126-bc1a2b34b1f9 or later.","affected":[{"fixed":"8.0.0-20260316060126-bc1a2b34b1f9","introduced":"8.0.0-20250721062209-4952acea88ce"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-27769"],"ecosystem":"Go","epss":0.00267,"exploited":false,"fixed_versions":["8.0.0-20260316060126-bc1a2b34b1f9"],"ghsa_id":"GHSA-mxxh-fmjq-j6x4","id":"tcs_01M5KFGN223P00MBM9X151YWH5","modified_at":"2026-06-25T23:11:32.697672257Z","published_at":"2026-04-17T15:31:17Z","references":["https://osv.dev/vulnerability/GHSA-mxxh-fmjq-j6x4","https://nvd.nist.gov/vuln/detail/CVE-2026-27769","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"low","score":2.7},"sources":[{"source":"osv","source_id":"GHSA-mxxh-fmjq-j6x4","url":"https://osv.dev/vulnerability/GHSA-mxxh-fmjq-j6x4"}],"summary":"Mattermost doesn't validate whether users were correctly owned by the correct Connected Workspace"}