{"id":"CVE-2017-18877","details":"An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. XSS attacks could occur against an OAuth 2.0 allow/deny page.","aliases":["GHSA-9x8x-w6g5-hx4w","GO-2025-4190"],"modified":"2026-07-31T18:31:40.303055780Z","published":"2020-06-19T17:15:12.257Z","related":["SUSE-SU-2025:4395-1","openSUSE-SU-2026:21483-1"],"database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"4.3.0-rc1"},{"last_affected":"4.3.0-rc1"},{"introduced":"4.3.0-rc3"},{"last_affected":"4.3.0-rc3"}],"source":"CPE_STRING","vendor_product":"mattermost:mattermost_server","cpes":["cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc1:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc3:*:*:*:*:*:*"]}]},"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost","events":[{"introduced":"0033e3e37b12cb5d951d21492500d66a6abc472b"},{"fixed":"61d6a7434b18612c52d0d6b7565032065262e096"},{"introduced":"a5ce36d0882ae1b4b409a7b68233bf89591a5f95"},{"fixed":"c0aafbcdc221970054869b6c03db77c1dcc63289"},{"introduced":"2a76eeeeee9acdd9aaebc3ec94a40254b933c966"},{"last_affected":"8966452d1183e94fecc373b9d08c65a0573cbbc6"}],"database_specific":{"source":["CPE_RANGE","CPE_STRING"],"cpe":["cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc1:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc2:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc3:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc4:*:*:*:*:*:*"],"extracted_events":[{"introduced":"4.1.0"},{"fixed":"4.1.2"},{"introduced":"4.2.0"},{"fixed":"4.2.1"},{"introduced":"4.3.0-rc1"},{"last_affected":"4.3.0-rc1"},{"introduced":"4.3.0-rc2"},{"last_affected":"4.3.0-rc2"},{"introduced":"4.3.0-rc3"},{"last_affected":"4.3.0-rc3"},{"introduced":"4.3.0-rc4"},{"last_affected":"4.3.0-rc4"}]}}],"versions":["4.3.0-rc1","4.3.0-rc2","4.3.0-rc3","v4.3.0-rc4","v4.3.0-rc3","v4.3.0","v4.3.0-rc2","v4.3.0-rc1","v4.1.1-rc1","v4.1.1","v4.2.0-rc4","v4.2.0","v4.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-18877.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}