{"id":"EUVD-2026-30374","revision":null,"records":[{"revision":"5f094704ee034dd682c2099b71c1ef3e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-24899","aliases":[],"title":"Fleet Windows MDM Azure AD JWT Authentication Bypass","description":"Fleet is open source device management software. Prior to version 4.82.0, a vulnerability in Fleet's Windows MDM enrollment flow allows authentication tokens from any Azure AD tenant to be accepted. Because Fleet validates JWT signatures using Microsoft's multi-tenant JWKS endpoint but does not enforce the `aud` (audience) or `iss` (issuer) claims, any Microsoft-signed Azure AD access token containing the expected scopes can be used to authenticate to Fleet's MDM endpoints. If Windows MDM is enabled, an attacker with access to any Azure AD tenant can obtain a valid Microsoft-signed token and use it to enroll unauthorized devices and interact with Fleet's MDM management APIs. During device management, Fleet may expose sensitive enrollment secrets embedded in MDM command payloads, enabling further unauthorized access. Version 4.82.0 contains a patch. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.","state":0,"publishedAt":"2026-05-14T18:58:26.55+00:00","modifiedAt":"2026-05-16T00:52:04.917+00:00","affected":[{"ecosystem":"Vendor product","name":"fleet","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"fleetdm\",\n                    \"product\": \"fleet\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 4.82.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":8.2,"severity":"HIGH"}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-ffg9-j72f-j6xm","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.82.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-24899","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-24899","identifiers":["CVE-2026-24899"]},"retained":false,"historicalAffected":[]},{"revision":"30b520e6b1a84f2688e9b68aa2408ba6","observedAt":"2026-10-28T02:08:05.917+00:00","statement":{"source":"euvd","id":"EUVD-2026-30374","aliases":["CVE-2026-24899","GHSA-ffg9-j72f-j6xm"],"title":"Fleet is open source device management software. Prior to version 4.82.0, a vulnerability in Fleet's Windows MDM enrollment flow allows authentication tokens from any Azure AD tenant to be accepted. Because Fleet validates JWT signatures us…","description":"Fleet is open source device management software. Prior to version 4.82.0, a vulnerability in Fleet's Windows MDM enrollment flow allows authentication tokens from any Azure AD tenant to be accepted. Because Fleet validates JWT signatures using Microsoft's multi-tenant JWKS endpoint but does not enforce the `aud` (audience) or `iss` (issuer) claims, any Microsoft-signed Azure AD access token containing the expected scopes can be used to authenticate to Fleet's MDM endpoints. If Windows MDM is enabled, an attacker with access to any Azure AD tenant can obtain a valid Microsoft-signed token and use it to enroll unauthorized devices and interact with Fleet's MDM management APIs. During device management, Fleet may expose sensitive enrollment secrets embedded in MDM command payloads, enabling further unauthorized access. Version 4.82.0 contains a patch. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":8.2,"severity":null}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-ffg9-j72f-j6xm","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.82.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30374","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 14, 2026, 6:58:26 PM","dateUpdated":"May 16, 2026, 12:52:04 AM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-30374","identifiers":["EUVD-2026-30374","CVE-2026-24899","GHSA-ffg9-j72f-j6xm"]},"retained":false,"historicalAffected":[]},{"revision":"71edcd94852d4fe8bea0c3aaed14d664","observedAt":"2026-10-27T06:23:40.774+00:00","statement":{"source":"nvd","id":"CVE-2026-24899","aliases":[],"title":"Fleet is open source device management software. Prior to version 4.82.0, a vulnerability in Fleet's Windows MDM enrollment flow allows authentication tokens from any Azure AD tenant to be accepted. Because Fleet validates JWT signatures us…","description":"Fleet is open source device management software. Prior to version 4.82.0, a vulnerability in Fleet's Windows MDM enrollment flow allows authentication tokens from any Azure AD tenant to be accepted. Because Fleet validates JWT signatures using Microsoft's multi-tenant JWKS endpoint but does not enforce the `aud` (audience) or `iss` (issuer) claims, any Microsoft-signed Azure AD access token containing the expected scopes can be used to authenticate to Fleet's MDM endpoints. If Windows MDM is enabled, an attacker with access to any Azure AD tenant can obtain a valid Microsoft-signed token and use it to enroll unauthorized devices and interact with Fleet's MDM management APIs. During device management, Fleet may expose sensitive enrollment secrets embedded in MDM command payloads, enabling further unauthorized access. Version 4.82.0 contains a patch. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.","state":0,"publishedAt":"2026-05-14T20:17:01.873+00:00","modifiedAt":"2026-10-26T14:10:00.13+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":8.2,"severity":"HIGH"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/fleetdm/fleet/releases/tag/fleet-v4.82.0","https://github.com/fleetdm/fleet/security/advisories/GHSA-ffg9-j72f-j6xm"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-24899","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-290"],"productCriteria":["cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-05-14T20:17:01.873","lastModified":"2026-10-26T14:10:00.130"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-24899","identifiers":["CVE-2026-24899"]},"retained":false,"historicalAffected":[]},{"revision":"386bba8851ce4f3c8f4493941c6b8f5c","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-ffg9-j72f-j6xm","aliases":["CVE-2026-24899","GO-2026-5358"],"title":"Fleet Windows MDM Azure AD JWT Authentication Bypass","description":"### Summary\n\nA vulnerability in Fleet's Windows MDM enrollment flow allows authentication tokens from any Azure AD tenant to be accepted. Because Fleet validates JWT signatures using Microsoft's multi-tenant JWKS endpoint but does not enforce the `aud` (audience) or `iss` (issuer) claims, any Microsoft-signed Azure AD access token containing the expected scopes can be used to authenticate to Fleet's MDM endpoints.\n\n### Impact\n\nIf Windows MDM is enabled, an attacker with access to any Azure AD tenant can obtain a valid Microsoft-signed token and use it to enroll unauthorized devices and interact with Fleet's MDM management APIs. During device management, Fleet may expose sensitive enrollment secrets embedded in MDM command payloads, enabling further unauthorized access.\n\n### Workarounds\n\nIf an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.\n\n### For more information\n\nIf you have any questions or comments about this advisory:\nEmail us at [security@fleetdm.com](mailto:security@fleetdm.com)\nJoin #fleet in [osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw)\n\n### Credits\n\nWe thank @zaddy6 for responsibly reporting this issue.","state":0,"publishedAt":"2026-05-14T13:13:56+00:00","modifiedAt":"2026-06-25T19:56:02.1804415+00:00","affected":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.82.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":null,"severity":null},{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-ffg9-j72f-j6xm","https://nvd.nist.gov/vuln/detail/CVE-2026-24899","https://github.com/fleetdm/fleet","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.82.0"],"sourceUrl":"https://github.com/advisories/GHSA-ffg9-j72f-j6xm","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-ffg9-j72f-j6xm","identifiers":["GHSA-ffg9-j72f-j6xm","CVE-2026-24899","GO-2026-5358"]},"retained":false,"historicalAffected":[]},{"revision":"a16f5de7ae29466dbff41c19ec2f59df","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5358","aliases":["CVE-2026-24899","GHSA-ffg9-j72f-j6xm"],"title":"Fleet Windows MDM Azure AD JWT Authentication Bypass in github.com/fleetdm/fleet","description":"Fleet Windows MDM Azure AD JWT Authentication Bypass in github.com/fleetdm/fleet","state":0,"publishedAt":"2026-06-25T18:43:19+00:00","modifiedAt":"2026-06-25T19:45:36.7808595+00:00","affected":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.82.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-ffg9-j72f-j6xm","https://nvd.nist.gov/vuln/detail/CVE-2026-24899","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.82.0"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5358","license":"OSV · upstream source license applies","key":"osv:GO-2026-5358","identifiers":["GO-2026-5358","CVE-2026-24899","GHSA-ffg9-j72f-j6xm"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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