{"id":"CVE-2017-18894","details":"An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5, when used as an OAuth 2.0 service provider. Sometimes. resource-owner authorization is bypassed, allowing account takeover.","aliases":["GHSA-gg42-mwr6-p82c","GO-2026-4297"],"modified":"2026-03-11T07:50:03.511042769Z","published":"2020-06-19T19:15:10.967Z","related":["SUSE-SU-2026:0142-1"],"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost-server","events":[{"introduced":"0"},{"fixed":"ff513427371cd84e07b19c0586d419dbed976b31"},{"introduced":"0033e3e37b12cb5d951d21492500d66a6abc472b"},{"fixed":"5549c9149e80537d0f431b6b3ebf638c35568c4f"}]}],"versions":["v4.1.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2017-18894.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}