{"action":"Upgrade github.com/fleetdm/fleet/v4 to 4.53.2 or later.","affected":[{"fixed":"4.64.2","introduced":"4.64.0"},{"fixed":"4.63.2","introduced":"4.63.0"},{"fixed":"4.62.4","introduced":"4.62.0"},{"fixed":"4.58.1","introduced":"4.54.0"},{"fixed":"4.53.2","introduced":"0"}],"component":"github.com/fleetdm/fleet/v4","cve_ids":["CVE-2025-27509"],"ecosystem":"Go","epss":0.00669,"exploited":false,"fixed_versions":["4.64.2","4.63.2","4.62.4","4.58.1","4.53.2"],"ghsa_id":"GHSA-52jx-g6m5-h735","id":"tcs_01M5KEXJD52A842K4MGF7PKNQ1","modified_at":"2026-02-03T03:11:21.791693Z","published_at":"2025-03-06T19:12:27Z","references":["https://osv.dev/vulnerability/GHSA-52jx-g6m5-h735","https://github.com/fleetdm/fleet/security/advisories/GHSA-52jx-g6m5-h735","https://nvd.nist.gov/vuln/detail/CVE-2025-27509","https://github.com/fleetdm/fleet/commit/718c95e47ad010ad6b8ceb3f3460e921fbfc53bb","https://github.com/fleetdm/fleet","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.64.2","https://pkg.go.dev/vuln/GO-2025-3505"],"severity":{"label":"critical","score":9.3},"sources":[{"source":"osv","source_id":"GHSA-52jx-g6m5-h735","url":"https://osv.dev/vulnerability/GHSA-52jx-g6m5-h735"},{"source":"nvd","source_id":"CVE-2025-27509","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-27509"}],"summary":"Fleet has SAML authentication vulnerability due to improper SAML response validation"}