{"schema_version":"1.7.3","id":"GHSA-fpcr-4rr5-hpcp","published":"2022-05-24T17:21:06Z","modified":"2026-02-19T20:41:01.127939Z","aliases":["CVE-2017-18906","GO-2026-4477"],"summary":"Mattermost Server vulnerable to user account takeover when Single Sign-On OAuth2 is used","details":"An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2, when Single Sign-On OAuth2 is used. An attacker could claim somebody else's account.","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":"3.9.2-0.20170714134023-b17fca0d5ee7"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-fpcr-4rr5-hpcp/GHSA-fpcr-4rr5-hpcp.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.10.0"},{"fixed":"3.10.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-fpcr-4rr5-hpcp/GHSA-fpcr-4rr5-hpcp.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-18906"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/259ad46f30d0fac2f7c5c14f3b76b2170f7e90c7"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/b17fca0d5ee7557e3df1cf1d1da8bd749859e35f"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/fbc170733e86f09b46ba754dd03304733d2f482f"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"database_specific":{"cwe_ids":["CWE-613"],"github_reviewed":true,"github_reviewed_at":"2026-02-06T22:42:23Z","nvd_published_at":"2020-06-19T20:15:00Z","severity":"HIGH"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}