{"action":"Upgrade github.com/mattermost/mattermost-server to 9.11.9+incompatible or later.","affected":[{"fixed":"9.11.9+incompatible","introduced":"9.11.0+incompatible"},{"fixed":"10.3.4+incompatible","introduced":"10.3.0+incompatible"},{"fixed":"10.4.3+incompatible","introduced":"10.4.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-27933"],"ecosystem":"Go","epss":0.00211,"exploited":false,"fixed_versions":["9.11.9+incompatible","10.3.4+incompatible","10.4.3+incompatible"],"ghsa_id":"GHSA-h5v9-xw2g-7hrq","id":"tcs_01M5KG7QMM44KVRYFQGTB3EXGR","modified_at":"2026-02-04T03:38:37.008945Z","published_at":"2025-03-25T19:38:11Z","references":["https://osv.dev/vulnerability/GO-2025-3556","https://github.com/advisories/GHSA-h5v9-xw2g-7hrq","https://nvd.nist.gov/vuln/detail/CVE-2025-27933","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GO-2025-3556","url":"https://osv.dev/vulnerability/GO-2025-3556"},{"source":"nvd","source_id":"CVE-2025-27933","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-27933"}],"summary":"Mattermost allows members with permission to convert public channels to private and convert private to public in github.com/mattermost/mattermost-server"}