{"action":"Upgrade github.com/fleetdm/fleet to 4.43.5-0.20260112202845-e225ef57912c or later.","affected":[{"fixed":"4.78.3","introduced":"4.78.0"},{"fixed":"4.77.1","introduced":"4.77.0"},{"fixed":"4.76.2","introduced":"4.76.0"},{"fixed":"4.75.2","introduced":"4.75.0"},{"fixed":"4.43.5-0.20260112202845-e225ef57912c","introduced":"0"}],"component":"github.com/fleetdm/fleet","cve_ids":["CVE-2026-23518"],"ecosystem":"Go","epss":0.00254,"exploited":false,"fixed_versions":["4.78.3","4.77.1","4.76.2","4.75.2","4.43.5-0.20260112202845-e225ef57912c"],"ghsa_id":"GHSA-63m5-974w-448v","id":"tcs_01M5KEZ8RH5YZ9M46YFKJPQTT6","modified_at":"2026-02-28T06:27:31.335156Z","published_at":"2026-01-20T20:55:17Z","references":["https://osv.dev/vulnerability/GHSA-63m5-974w-448v","https://github.com/fleetdm/fleet/security/advisories/GHSA-63m5-974w-448v","https://nvd.nist.gov/vuln/detail/CVE-2026-23518","https://github.com/fleetdm/fleet/commit/e225ef57912c8f4ac8977e24b5ebe1d9fd875257","https://github.com/fleetdm/fleet","https://pkg.go.dev/vuln/GO-2026-4335"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"GHSA-63m5-974w-448v","url":"https://osv.dev/vulnerability/GHSA-63m5-974w-448v"},{"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"}