cvedb.io
CVE-2026-23518
CRITICAL · CVSS 9.8
EPSS exploitation probability: 0%
Published 2026-01-21T22:15:50.140 · Last modified 2026-06-17T10:21:42.850

Summary

Fleet is open source device management software. In versions prior to 4.78.3, 4.77.1, 4.76.2, 4.75.2, and 4.53.3, a vulnerability in Fleet's Windows MDM enrollment flow could allow an attacker to submit forged authentication tokens that are not properly validated. Because JWT signatures were not verified, Fleet could accept attacker-controlled identity claims, enabling enrollment of unauthorized devices under arbitrary Azure AD user identities. Versions 4.78.3, 4.77.1, 4.76.2, 4.75.2, and 4.53.3 fix the issue. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.

Affected products

fleetdm — fleet

Does this affect you?

Add your gear to cvedb and we'll alert you only when fleetdm ships something exploited.

Check my exposure →

References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.