{"action":"Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20251028000919-d3ed703dc833 or later.","affected":[{"fixed":"8.0.0-20251028000919-d3ed703dc833","introduced":"0"}],"component":"github.com/mattermost/mattermost/server/v8","cve_ids":["CVE-2025-12419"],"ecosystem":"Go","epss":0.00367,"exploited":false,"fixed_versions":["8.0.0-20251028000919-d3ed703dc833"],"ghsa_id":"GHSA-3x39-62h4-f8j6","id":"tcs_01M5KGBZMAR6GRTDQKCZEEAWBV","modified_at":"2026-03-03T04:57:42.597188Z","published_at":"2025-12-15T20:33:49Z","references":["https://osv.dev/vulnerability/GO-2025-4168","https://github.com/advisories/GHSA-3x39-62h4-f8j6","https://nvd.nist.gov/vuln/detail/CVE-2025-12419","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/mattermost/mattermost/pull/34296","https://mattermost.com/security-updates"],"severity":{"label":"critical","score":9.9},"sources":[{"source":"osv","source_id":"GO-2025-4168#Go/github.com/mattermost/mattermost/server/v8","url":"https://osv.dev/vulnerability/GO-2025-4168"},{"source":"nvd","source_id":"CVE-2025-12419","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-12419"}],"summary":"Mattermost fails to properly validate OAuth state tokens during OpenID Connect authentication in github.com/mattermost/mattermost-server"}