{"action":"Upgrade github.com/mattermost/mattermost-server to 5.3.2-0.20251209134645-761e56bb11cc or later.","affected":[{"introduced":"11.1.0"},{"introduced":"10.11.0"},{"introduced":"11.2.0"},{"fixed":"5.3.2-0.20251209134645-761e56bb11cc","introduced":"0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-14350"],"ecosystem":"Go","epss":0.00189,"exploited":false,"fixed_versions":["5.3.2-0.20251209134645-761e56bb11cc"],"ghsa_id":"GHSA-57cc-2pf4-mhmx","id":"tcs_01M5KEXXBK05AREV1VF7A130GB","modified_at":"2026-04-01T17:34:52.830031Z","published_at":"2026-02-16T15:32:47Z","references":["https://osv.dev/vulnerability/GHSA-57cc-2pf4-mhmx","https://nvd.nist.gov/vuln/detail/CVE-2025-14350","https://github.com/mattermost/mattermost/commit/761e56bb11ccb751ddbe4bab5898ccc2b384fd82","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GHSA-57cc-2pf4-mhmx#Go/github.com/mattermost/mattermost-server","url":"https://osv.dev/vulnerability/GHSA-57cc-2pf4-mhmx"}],"summary":"Mattermost fails to properly validate team membership when processing channel mentions"}