{"action":"Upgrade github.com/mattermost/mattermost-server to 3.6.7-rc1+incompatible or later.","affected":[{"fixed":"3.6.7-rc1+incompatible","introduced":"0"},{"fixed":"3.7.5+incompatible","introduced":"3.7.0+incompatible"},{"fixed":"3.8.2+incompatible","introduced":"3.8.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2017-18911"],"ecosystem":"Go","epss":0.00669,"exploited":false,"fixed_versions":["3.6.7-rc1+incompatible","3.7.5+incompatible","3.8.2+incompatible"],"ghsa_id":"GHSA-m462-mqw4-2c8m","id":"tcs_01M5KGDWPWV7ZC7MYBC8F7BEB6","modified_at":"2026-02-19T20:41:26.362107Z","published_at":"2026-02-17T18:09:06Z","references":["https://osv.dev/vulnerability/GO-2026-4464","https://github.com/advisories/GHSA-m462-mqw4-2c8m","https://nvd.nist.gov/vuln/detail/CVE-2017-18911","https://github.com/mattermost/mattermost/commit/222bce0c5c1abb2f58c3a6de1fe8c5d3accffb21","https://github.com/mattermost/mattermost/commit/691c18157025d4808b5b11de1d6de01050e54fa6","https://github.com/mattermost/mattermost/commit/e9bb8cdfb4915067349a4840ab15ff941c4eb070","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-4464","url":"https://osv.dev/vulnerability/GO-2026-4464"}],"summary":"Mattermost Server has X.509 Improper Certificate Validation in github.com/mattermost/mattermost-server"}