{"cve":"CVE-2026-24899","nvd":{"published":"2026-05-14T20:17:01.873","modified":"2026-10-26T14:10:00.130","status":"Analyzed","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.","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":8.2},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-290"],"references":["https://github.com/fleetdm/fleet/releases/tag/fleet-v4.82.0","https://github.com/fleetdm/fleet/security/advisories/GHSA-ffg9-j72f-j6xm"],"products":["fleetdm:fleet"],"source":"nvd","synced_at":"2026-10-26T14:27:29.784594657+00:00"},"epss":{"cve":"CVE-2026-24899","score":0.00381,"percentile":0.31802,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-ffg9-j72f-j6xm","url":"https://osv.dev/vulnerability/GHSA-ffg9-j72f-j6xm","summary":"Fleet Windows MDM Azure AD JWT Authentication Bypass","modified":"2026-06-25T19:56:02.180441469Z","packages":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","purl":"pkg:golang/github.com/fleetdm/fleet/v4","ranges":["<4.82.0"],"fixed":["4.82.0"]}]},{"id":"GO-2026-5358","url":"https://osv.dev/vulnerability/GO-2026-5358","summary":"Fleet Windows MDM Azure AD JWT Authentication Bypass in github.com/fleetdm/fleet","modified":"2026-06-25T19:45:36.780859528Z","packages":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","purl":"pkg:golang/github.com/fleetdm/fleet/v4","ranges":["<4.82.0"],"fixed":["4.82.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}