Vulnerability record · CVE-2026-103264 · published 1 October 2026

CVE-2026-103264: Fleetdm fleet improper authentication vulnerability

Fleetdm · Fleet

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.

9.3 CVSS 4.0 Critical EPSS 0.31% · top 78.4% CWE-287 · Improper authentication

9.3CVSS 4.0 base score

0.31%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References

8 Oct 2026Last modified by NVD

Description

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Fleet Fleetdm

References

Link	Tags
https://github.com/fleetdm/fleet/security/advisories/GHSA-vrc8-2wcx-327f	Vendor Advisory
https://www.vulncheck.com/advisories/fleet-before-4.87.0-authentication-bypass-via-device-identifiers	Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-103264), CISA KEV, FIRST EPSS (scores of 2026-10-14). This page is refreshed as NVD updates the record.