{"id":"CVE-2017-18903","aliases":["GHSA-fcwg-45jh-5qhf","GO-2026-4305"],"url":"https://o3.security/vulnerability/CVE-2017-18903","summary":"Mattermost Server vulnerable to CSRF if CORS is enabled","details":"An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2. CSRF can occur if CORS is enabled.","published":"2020-06-19T19:15:11.717Z","modified":"2026-07-31T18:31:22.633642471Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"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":null,"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T18:31:22.633642471Z"}}