Cloudanix VulnDB

CVE-2026-23518

Critical · 9.8

CVSS

9.8

EPSS

0.3%

Published

Jan 21, 2026

CISA due date

—

The record

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 packages

Ecosystem Package Introduced Fixed
Go github.com/fleetdm/fleet 0 4.43.5-0.20260112202845-e225ef57912c
Go github.com/fleetdm/fleet 4.75.0 4.75.2
Go github.com/fleetdm/fleet 4.76.0 4.76.2
Go github.com/fleetdm/fleet 4.77.0 4.77.1
Go github.com/fleetdm/fleet 4.78.0 4.78.3
Go github.com/fleetdm/fleet/v4 4.75.0 4.75.2
go github.com/fleetdm/fleet 4.75.0 4.75.2
go github.com/fleetdm/fleet 4.76.0 4.76.2
go github.com/fleetdm/fleet 4.77.0 4.77.1
go github.com/fleetdm/fleet 4.78.0 4.78.3
openSUSE:Leap 15.6 govulncheck-vulndb 0 0.0.20260205T172317-150000.1.146.1

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