Critical severity9.1NVD Advisory· Published Oct 1, 2026

CVE-2026-103264

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.

Affected products

Fleetdm/Fleetllm-fuzzy
Range: <4.87.0

Patches

Vulnerability mechanics

References

github.com/fleetdm/fleet/security/advisories/GHSA-vrc8-2wcx-327fnvd
www.vulncheck.com/advisories/fleet-before-4.87.0-authentication-bypass-via-device-identifiersnvd

News mentions

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cvss	0.591
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000