{"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":"2026-08-27T08:19:00.592944Z","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":null,"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T08:19:00.592944Z"}}