{"schema_version":"1.7.3","id":"GHSA-3x39-62h4-f8j6","published":"2025-11-27T18:30:25Z","modified":"2025-12-17T00:58:26.257753Z","aliases":["CVE-2025-12419","GO-2025-4168"],"summary":"Mattermost fails to properly validate OAuth state tokens during OpenID Connect authentication","details":"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.","affected":[{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.0.0-20251028000919-d3ed703dc833"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/11/GHSA-3x39-62h4-f8j6/GHSA-3x39-62h4-f8j6.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.12.0"},{"fixed":"10.12.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/11/GHSA-3x39-62h4-f8j6/GHSA-3x39-62h4-f8j6.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.11.0"},{"fixed":"10.11.5"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/11/GHSA-3x39-62h4-f8j6/GHSA-3x39-62h4-f8j6.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.5.0"},{"fixed":"10.5.13"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/11/GHSA-3x39-62h4-f8j6/GHSA-3x39-62h4-f8j6.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"11.0.0"},{"fixed":"11.0.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/11/GHSA-3x39-62h4-f8j6/GHSA-3x39-62h4-f8j6.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-12419"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/pull/34296"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/15364790cc277cfaa372693d2d5442b87f70fd42"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/364c2203de00fe0d8424b6b46d6f0eeb02a2539a"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/46b5c436bb3093cc1da3fa2455f93d4c52389eee"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/c3f4818afe46a7084740e809708ae22641c76d8d"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/d3ed703dc8330684952eb8d49a375bac6ea7b0c6"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-3x39-62h4-f8j6"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"database_specific":{"cwe_ids":["CWE-287","CWE-303"],"github_reviewed":true,"github_reviewed_at":"2025-12-01T23:56:55Z","nvd_published_at":"2025-11-27T16:15:46Z","severity":"CRITICAL"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}]}