https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-08T19:47:27.330560+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-266349 EUVD-2026-266349 2026-10-08T19:47:27.333200+00:00 EUVD-2026-266349 https://cve.radiocsirt.org/vuln/fkie_cve-2026-23518 fkie_cve-2026-23518 2026-10-08T19:47:27.333242+00:00

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.

 https://cve.radiocsirt.org/vuln/ghsa-63m5-974w-448v GHSA-63m5-974w-448v — Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment 2026-10-08T19:47:27.333289+00:00

Affected: Go: github.com/fleetdm/fleet

### Summary

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.

### Impact

If Windows MDM is enabled, an attacker can enroll rogue devices by submitting a forged JWT containing arbitrary identity claims. Due to missing JWT signature verification, Fleet accepts these claims without validating that the token was issued by Azure AD, allowing enrollment under any Azure AD user identity.

### Patches

- 4.78.3 - 4.77.1 - 4.76.2 - 4.75.2 - 4.53.3

### Workarounds

If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.

### For more information

If you have any questions or comments about this advisory:

Email us at [security@fleetdm.com](mailto:security@fleetdm.com) Join #fleet in [osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw)

### Credits

We thank @secfox-ai for responsibly reporting this issue.