{"action":"Upgrade github.com/mattermost/mattermost-server to 9.11.9 or later.","affected":[{"fixed":"9.11.9","introduced":"0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-27933"],"ecosystem":"Go","epss":0.00211,"exploited":false,"fixed_versions":["9.11.9"],"ghsa_id":"GHSA-h5v9-xw2g-7hrq","id":"tcs_01M5KFBZDMJRSWKZGEF075QME5","modified_at":"2026-09-10T03:50:23.194301319Z","published_at":"2025-03-21T09:30:35Z","references":["https://osv.dev/vulnerability/GHSA-h5v9-xw2g-7hrq","https://nvd.nist.gov/vuln/detail/CVE-2025-27933","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"GHSA-h5v9-xw2g-7hrq#Go/github.com/mattermost/mattermost-server","url":"https://osv.dev/vulnerability/GHSA-h5v9-xw2g-7hrq"}],"summary":"Mattermost allows members with permission to convert public channels to private and convert private to public"}