{"id":"CVE-2017-18906","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.","aliases":["GHSA-fpcr-4rr5-hpcp","GO-2026-4477"],"modified":"2026-03-14T09:25:40.755074Z","published":"2020-06-19T20:15:12.147Z","related":["SUSE-SU-2026:0757-1"],"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost-server","events":[{"introduced":"0"},{"fixed":"6a2754376c8c8270be5e11e3fdab589659d0cc8d"},{"introduced":"8b83e9d4279718c8f9797c6a9c081245231cbba0"},{"fixed":"f06c5bef4d78966c60b153bbec6eea4ec0be9e68"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"3.9.2"},{"introduced":"3.10.0"},{"fixed":"3.10.2"}]}}],"versions":["v3.10.0","v3.10.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-18906.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}