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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
fleetdm fleet unaffected
Version Status Constraints
0 affected < 4.87.0
4.87.0 unaffected —

No data.

No data.

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Project Subscriptions

Vendors Products
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Fleet Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/fleetdm/fleet/security/advisories/GHSA-vrc8-2wcx-327f cve-icon cve-icon
https://www.vulncheck.com/advisories/fleet-before-4.87.0-authentication-bypass-via-device-identifiers cve-icon cve-icon
History

Thu, 01 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Thu, 01 Oct 2026 11:00:00 +0000

Type Values Removed Values Added
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.
Title Fleet before 4.87.0 Authentication Bypass via Device Identifiers
First Time appeared Fleetdm
Fleetdm fleet
Weaknesses CWE-287
CPEs cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*
Vendors & Products Fleetdm
Fleetdm fleet
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 9.3, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-01T13:32:04.417Z

Reserved: 2026-09-30T10:58:33.573Z

Link: CVE-2026-103264

cve-icon Vulnrichment

Updated: 2026-10-01T13:30:43.190Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-01T11:17:21.410

Modified: 2026-10-01T15:09:04.013

Link: CVE-2026-103264

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-01T14:15:09Z

Weaknesses