{"schema_version":"1.7.3","id":"GHSA-r6j5-fqx9-7qv9","published":"2022-05-24T17:21:06Z","modified":"2026-02-19T20:41:06.840451Z","aliases":["CVE-2017-18909","GO-2026-4478"],"summary":"Mattermost Server SAML implementation does not require encryption or signature verification as default","details":"An issue was discovered in Mattermost Server before 3.9.0 when SAML is used. Encryption and signature verification are not mandatory.","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":"3.8.1-0.20170504181128-4f074fed0d65"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-r6j5-fqx9-7qv9/GHSA-r6j5-fqx9-7qv9.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-18909"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/4f074fed0d653a28779ac586e418341232d43e95"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"database_specific":{"cwe_ids":["CWE-311","CWE-347"],"github_reviewed":true,"github_reviewed_at":"2026-02-06T22:50:29Z","nvd_published_at":"2020-06-19T19:15:00Z","severity":"HIGH"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}