{"id":"CVE-2018-21263","details":"An issue was discovered in Mattermost Server before 4.7.0, 4.6.2, and 4.5.2. An attacker could authenticate to a different user's account via a crafted SAML response.","modified":"2026-08-27T08:14:32.225295Z","published":"2020-06-19T17:15:13.067Z","references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost","events":[{"introduced":"0"},{"fixed":"03f5c939deb4a6ab2fd01639b5570799e4118bab"},{"introduced":"58defb7424773c75718f0173f4ace702cffa4f0e"},{"fixed":"cc82749d4f8c47bce201123aedcd8c564ceffcb8"},{"introduced":"9a73f9988588b6b1be5711634239381fe9e01d16"},{"last_affected":"9360131992064203f9ee46fa0504d20276c97339"}],"database_specific":{"cpe":["cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.7.0:rc1:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.7.0:rc2:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.7.0:rc3:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.7.0:rc4:*:*:*:*:*:*"],"extracted_events":[{"introduced":"0"},{"fixed":"4.5.2"},{"introduced":"4.6.0"},{"fixed":"4.6.2"},{"introduced":"4.7.0-rc1"},{"last_affected":"4.7.0-rc1"},{"introduced":"4.7.0-rc2"},{"last_affected":"4.7.0-rc2"},{"introduced":"4.7.0-rc3"},{"last_affected":"4.7.0-rc3"},{"introduced":"4.7.0-rc4"},{"last_affected":"4.7.0-rc4"}],"source":["CPE_RANGE","CPE_STRING"]}}],"versions":["4.7.0-rc1","4.7.0-rc2","4.7.0-rc3","4.7.0-rc4","v4.7.0-rc4","v4.7.0","v4.7.0-rc3","v4.7.0-rc2","v4.7.0-rc1","v4.6.0-rc6","v4.6.0-rc5","v4.6.0","v4.5.0-rc1","v4.4.0-rc1","v4.3.0-rc1","v4.2.0-rc1","v0.5.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-21263.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}