🛡️ CVE-2026-23518
🔴 CVSS 9.8 — Critical ✅ No Known Exploit CWE-347 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity CRITICAL
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-347
Public Exploit ✅ No
Source NVD
Published 2026-01-21
Updated 2026-06-02
Modified 2026-02-27

Affected Packages

Software From version Fixed in
fleet — —
github.com/fleetdm/fleet — —
github.com/fleetdm/fleet/v4 — —

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