CVE-2026-103264

Critical

Description

Fleet versions before 4.87.0 contain an authentication bypass vulnerability in the device API that accepts hostnames and hardware serials as authentication tokens in addition to device UUIDs. Unauthenticated attackers who know or guess these non-secret identifiers can authenticate as iOS/iPadOS hosts to read device data and trigger device-scoped actions including software installation and MDM migration.

SeverityCritical

CVSS9.1

Exploit probability—

ProductFleet

PublishedOct 1, 2026

First seenOct 1, 2026

Weakness typeCWE-287Improper authentication

How to fix

Update

fleetdm fleet4.87.0 or later

Vendor advisories

github.com/fleetdm/fleet/security/advisories/GHSA-vrc8-2wcx-327f

Affected products

Product	Affected versions	Fixed in
fleetdm fleet	v < 4.87.0	4.87.0

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