{"action":"Upgrade github.com/mattermost/mattermost-server to 10.5.13 or later.","affected":[{"fixed":"10.12.2","introduced":"10.12.0"},{"fixed":"10.11.5","introduced":"10.11.0"},{"fixed":"10.5.13","introduced":"10.5.0"},{"fixed":"11.0.4","introduced":"11.0.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-12419"],"ecosystem":"Go","epss":0.00367,"exploited":false,"fixed_versions":["10.12.2","10.11.5","10.5.13","11.0.4"],"ghsa_id":"GHSA-3x39-62h4-f8j6","id":"tcs_01M5KEVGW1XYFK1M44BWMWMNVG","modified_at":"2025-12-17T00:58:26.257753Z","published_at":"2025-11-27T18:30:25Z","references":["https://osv.dev/vulnerability/GHSA-3x39-62h4-f8j6","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"],"severity":{"label":"critical","score":9.9},"sources":[{"source":"osv","source_id":"GHSA-3x39-62h4-f8j6#Go/github.com/mattermost/mattermost-server","url":"https://osv.dev/vulnerability/GHSA-3x39-62h4-f8j6"}],"summary":"Mattermost fails to properly validate OAuth state tokens during OpenID Connect authentication"}