User Impersonation Affecting github.com/fleetdm/fleet/server/mdm/microsoft package, versions <4.82.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published7 Jun 2026
- disclosed14 May 2026
- creditIsaac David, Arthur Gervais
Introduced: 14 May 2026
CVE-2026-24899 Â (opens in a new tab)How to fix?
Upgrade github.com/fleetdm/fleet/server/mdm/microsoft to version 4.82.0 or higher.
Overview
Affected versions of this package are vulnerable to User Impersonation due to improper validation of JWT aud and iss claims in the Windows MDM authentication flow. An attacker can enroll unauthorized devices by presenting a valid Microsoft-signed Azure AD token from any tenant. This is only exploitable if Windows MDM is enabled.