CVE-2026-103264: Fleetdm Fleet

Critical severity, CVSS 9.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Fleetdm Fleet: before 4.87.0 (fixed in 4.87.0)

Published 2026-10-01. Last modified 2026-10-08.