{"id":"GHSA-3x39-62h4-f8j6","revision":"c59efcef82744361aca078930e7459a6","records":[{"revision":"c59efcef82744361aca078930e7459a6","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-3x39-62h4-f8j6","aliases":["CVE-2025-12419","GO-2025-4168"],"title":"Mattermost fails to properly validate OAuth state tokens during OpenID Connect authentication","description":"Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation privileges to take over a user account via manipulation of authentication data during the OAuth completion flow. This requires email verification to be disabled (default: disabled), OAuth/OpenID Connect to be enabled, and the attacker to control two users in the SSO system with one of them never having logged into Mattermost.","state":0,"publishedAt":"2025-11-27T18:30:25+00:00","modifiedAt":"2025-12-17T00:58:26.257753+00:00","affected":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"8.0.0-20251028000919-d3ed703dc833"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"10.12.0"},{"kind":"fixed","version":"10.12.2"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"10.11.0"},{"kind":"fixed","version":"10.11.5"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"10.5.0"},{"kind":"fixed","version":"10.5.13"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"11.0.0"},{"kind":"fixed","version":"11.0.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://nvd.nist.gov/vuln/detail/CVE-2025-12419","https://github.com/mattermost/mattermost/pull/34296","https://github.com/mattermost/mattermost/commit/15364790cc277cfaa372693d2d5442b87f70fd42","https://github.com/mattermost/mattermost/commit/364c2203de00fe0d8424b6b46d6f0eeb02a2539a","https://github.com/mattermost/mattermost/commit/46b5c436bb3093cc1da3fa2455f93d4c52389eee","https://github.com/mattermost/mattermost/commit/c3f4818afe46a7084740e809708ae22641c76d8d","https://github.com/mattermost/mattermost/commit/d3ed703dc8330684952eb8d49a375bac6ea7b0c6","https://github.com/advisories/GHSA-3x39-62h4-f8j6","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"sourceUrl":"https://github.com/advisories/GHSA-3x39-62h4-f8j6","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-3x39-62h4-f8j6","identifiers":["GHSA-3x39-62h4-f8j6","CVE-2025-12419","GO-2025-4168"]},"retained":false,"historicalAffected":[]}],"coverage":[]}