{"id":"CVE-2017-18905","aliases":["GHSA-g24c-fx4v-xg9w","GO-2026-4306"],"url":"https://o3.security/vulnerability/CVE-2017-18905","summary":"Mattermost Server has Insufficient Session Expiration when used as an OAuth 2.0 service provider","details":"An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2, when used as an OAuth 2.0 service provider, Session invalidation was mishandled.","published":"2020-06-19T20:15:12.087Z","modified":"2026-07-31T18:31:19.132448955Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"3.9.2"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"3.10.2"}],"fix":{"url":"https://github.com/mattermost/mattermost/commit/15ad24d160cb4604d0605ebbfa53d11a57820706","label":"mattermost/mattermost@15ad24d"},"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-18905"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/15ad24d160cb4604d0605ebbfa53d11a57820706"},{"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T18:31:19.132448955Z"}}