CVE-2026-103264

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.

CVSS 4.0

9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 23% of CVEs (scores of 2026-10-25)

CWE

CWE-287

Published

2026-10-01

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

Affected

• fleetdm:fleet

References

• https://github.com/fleetdm/fleet/security/advisories/GHSA-vrc8-2wcx-327f
• https://www.vulncheck.com/advisories/fleet-before-4.87.0-authentication-bypass-via-device-identifiers

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