{"schema_version":"1.7.3","id":"GHSA-m462-mqw4-2c8m","published":"2022-05-24T17:21:07Z","modified":"2026-02-22T23:03:29.930080Z","aliases":["CVE-2017-18911","GO-2026-4464"],"summary":"Mattermost Server has X.509 Improper Certificate Validation","details":"An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. The X.509 certificate validation can be skipped for a TLS-based e-mail server.","affected":[{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.6.7-rc1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-m462-mqw4-2c8m/GHSA-m462-mqw4-2c8m.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.7.0"},{"fixed":"3.7.5"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-m462-mqw4-2c8m/GHSA-m462-mqw4-2c8m.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.8.0"},{"fixed":"3.8.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-m462-mqw4-2c8m/GHSA-m462-mqw4-2c8m.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-18911"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/222bce0c5c1abb2f58c3a6de1fe8c5d3accffb21"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/691c18157025d4808b5b11de1d6de01050e54fa6"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/e9bb8cdfb4915067349a4840ab15ff941c4eb070"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"database_specific":{"cwe_ids":["CWE-295"],"github_reviewed":true,"github_reviewed_at":"2026-02-06T22:58:06Z","nvd_published_at":"2020-06-19T19:15:00Z","severity":"CRITICAL"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}