{"id":"EUVD-2026-30374","enisaUuid":"898e59fd-df99-35ff-b9ef-7f19424d97bd","description":"Fleet is open source device management software. Prior to version 4.82.0, a vulnerability in Fleet\u0027s Windows MDM enrollment flow allows authentication tokens from any Azure AD tenant to be accepted. Because Fleet validates JWT signatures using Microsoft\u0027s 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\u0027s 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\u0027s 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.","datePublished":"May 14, 2026, 6:58:26 PM","dateUpdated":"May 16, 2026, 12:52:04 AM","baseScore":8.2,"baseScoreVersion":"4.0","baseScoreVector":"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","references":"https://github.com/fleetdm/fleet/security/advisories/GHSA-ffg9-j72f-j6xm\nhttps://github.com/fleetdm/fleet/releases/tag/fleet-v4.82.0\n","aliases":"CVE-2026-24899\nGHSA-ffg9-j72f-j6xm\n","assigner":"GitHub_M","epss":0.38,"enisaIdProduct":[{"id":"eaca21f6-7f5b-3203-b1d7-fa6d8ef4268d","product":{"name":"Fleet","vendor":{"name":"fleetdm"}},"product_version":"\u003c 4.82.0"}],"enisaIdVendor":[{"id":"17b52ec9-2541-363d-bfa3-6d081a4d19f2","vendor":{"name":"fleetdm"}}],"enisaIdVulnerability":[{"id":"0b406423-84d5-390b-b454-c8b29d9be55e","vulnerability":{"id":"GHSA-ffg9-j72f-j6xm","description":"Fleet Windows MDM Azure AD JWT Authentication Bypass","datePublished":"May 14, 2026, 1:13:56 PM","dateUpdated":"Jun 8, 2026, 11:26:12 PM","baseScore":0.0,"references":"https://github.com/fleetdm/fleet/security/advisories/GHSA-ffg9-j72f-j6xm\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-24899\nhttps://github.com/fleetdm/fleet\nhttps://github.com/fleetdm/fleet/releases/tag/fleet-v4.82.0\n","enisa_id":"EUVD-2026-30374\n","aliases":"CVE-2026-24899\nGHSA-ffg9-j72f-j6xm\n","epss":0.0,"dataProcessed":"Oct 25, 2026, 1:55:50 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}},{"id":"0c565c22-efd5-3083-b029-ca59f78fc939","vulnerability":{"id":"CVE-2026-24899","description":"Fleet is open source device management software. Prior to version 4.82.0, a vulnerability in Fleet\u0027s Windows MDM enrollment flow allows authentication tokens from any Azure AD tenant to be accepted. Because Fleet validates JWT signatures using Microsoft\u0027s 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\u0027s 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\u0027s 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.","datePublished":"May 14, 2026, 6:58:26 PM","dateUpdated":"May 16, 2026, 12:52:04 AM","status":"PUBLISHED","baseScore":8.2,"baseScoreVersion":"4.0","baseScoreVector":"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","references":"https://github.com/fleetdm/fleet/security/advisories/GHSA-ffg9-j72f-j6xm\nhttps://github.com/fleetdm/fleet/releases/tag/fleet-v4.82.0\n","enisa_id":"EUVD-2026-30374\n","assigner":"GitHub_M","epss":0.38,"dataProcessed":"Oct 27, 2026, 7:15:22 AM","vulnerabilityProduct":[{"id":"2d7b6e5f-8ab1-370e-9290-9e5683554878","product":{"name":"Fleet","vendor":{"name":"fleetdm"}},"product_version":"\u003c 4.82.0"}],"vulnerabilityVendor":[{"id":"5429b256-1733-37e9-84fb-77b5217965cb","vendor":{"name":"fleetdm"}}]}}],"enisaIdAdvisory":[]}