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Description

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.

PUBLISHED Reserved 2026-01-13 | Published 2026-01-21 | Updated 2026-01-22 | Assigner GitHub_M




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-347: Improper Verification of Cryptographic Signature

Product status

>= 4.78.0, < 4.78.3
affected

>= 4.77.0, < 4.77.1
affected

>= 4.76.0, < 4.76.2
affected

>= 4.75.0, < 4.75.2
affected

< 4.53.3
affected

References

github.com/.../fleet/security/advisories/GHSA-63m5-974w-448v

github.com/...ommit/e225ef57912c8f4ac8977e24b5ebe1d9fd875257

cve.org (CVE-2026-23518)

nvd.nist.gov (CVE-2026-23518)

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