{"action":"Upgrade github.com/fleetdm/fleet/v4 to 4.75.2 or later.","affected":[{"fixed":"4.75.2","introduced":"4.75.0"},{"fixed":"4.76.2","introduced":"4.76.0"},{"fixed":"4.77.1","introduced":"4.77.0"},{"fixed":"4.78.3","introduced":"4.78.0"}],"component":"github.com/fleetdm/fleet/v4","cve_ids":["CVE-2026-23518"],"ecosystem":"Go","epss":0.00254,"exploited":false,"fixed_versions":["4.75.2","4.76.2","4.77.1","4.78.3"],"ghsa_id":"GHSA-63m5-974w-448v","id":"tcs_01M5KGD5X3WG5F0KKP5BJAZM1Y","modified_at":"2026-02-04T19:07:54Z","published_at":"2026-02-03T20:37:17Z","references":["https://osv.dev/vulnerability/GO-2026-4335","https://github.com/fleetdm/fleet/security/advisories/GHSA-63m5-974w-448v","https://github.com/fleetdm/fleet/commit/e225ef57912c8f4ac8977e24b5ebe1d9fd875257"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"GO-2026-4335","url":"https://osv.dev/vulnerability/GO-2026-4335"},{"source":"nvd","source_id":"CVE-2026-23518","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23518"}],"summary":"Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment in github.com/fleetdm/fleet"}