{"id":"CVE-2017-18878","aliases":["GHSA-h564-6gc2-fcc6","GO-2025-4191"],"url":"https://o3.security/vulnerability/CVE-2017-18878","summary":"Mattermost Server allows users with a session ID to revoke another users' session","details":"An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. Knowledge of a session ID allows revoking another user's session.","published":"2020-06-19T19:15:10.013Z","modified":"2026-10-24T10:30:23.649518316Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"4.1.2-0.20171004201910-6be8113eb60c"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"4.2.1-0.20171004192657-8fbbd688ea24"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"4.3.0"}],"fix":{"url":"https://github.com/mattermost/mattermost/commit/6be8113eb60cf5ddd2dc1c3f4db05cae0c183086","label":"mattermost/mattermost@6be8113"},"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-18878"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/6be8113eb60cf5ddd2dc1c3f4db05cae0c183086"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/8fbbd688ea2466dd0d70e9c07e9703d78f8a19a5"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/affd35071ea155069979fd359726296de8aa6aaf"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-24T10:30:23.649518316Z"}}