{"action":"Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20251209134645-761e56bb11cc or later.","affected":[{"fixed":"8.0.0-20251209134645-761e56bb11cc","introduced":"0"}],"component":"github.com/mattermost/mattermost/server/v8","cve_ids":["CVE-2025-14350"],"ecosystem":"Go","epss":0.00189,"exploited":false,"fixed_versions":["8.0.0-20251209134645-761e56bb11cc"],"ghsa_id":"GHSA-57cc-2pf4-mhmx","id":"tcs_01M5KGE8DQNVJ1R1QJJ3Y2V5WD","modified_at":"2026-02-23T19:26:21.732786Z","published_at":"2026-02-23T18:23:12Z","references":["https://osv.dev/vulnerability/GO-2026-4521","https://github.com/advisories/GHSA-57cc-2pf4-mhmx","https://nvd.nist.gov/vuln/detail/CVE-2025-14350","https://github.com/mattermost/mattermost/commit/761e56bb11ccb751ddbe4bab5898ccc2b384fd82","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GO-2026-4521#Go/github.com/mattermost/mattermost/server/v8","url":"https://osv.dev/vulnerability/GO-2026-4521"},{"source":"nvd","source_id":"CVE-2025-14350","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-14350"}],"summary":"Mattermost fails to properly validate team membership when processing channel mentions in github.com/mattermost/mattermost-server"}