CVE-2026-103264CWE-287

CVE-2026-103264

Critical · published October 1, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
22.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00305 · 22.1th percentile
Weakness
CWE-287 · Improper Authentication
Published
2026-10-01T15:17Z
Affected products (1)
ProductVersionsFixed in
fleetdm/fleet< 4.87.04.87.0
References (2)
https://github.com/fleetdm/fleet/security/advisories/GHSA-vrc8-2wcx-327f · [email protected]https://www.vulncheck.com/advisories/fleet-before-4.87.0-authentication-bypass-via-device-identifiers · [email protected]
EPSS history
Timeline
  • 03 OCT 03:41Z
    EPSS moved — → 0%
    epss
  • 01 OCT 10:42Z
    Fleet before 4.87.0 Authentication Bypass via Device Identifiers
    cvelistv5