CVE-2026-103264: Improper Authentication in 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.
AI Analysis
Technical Summary
CVE-2026-103264 describes an authentication bypass vulnerability in fleetdm's fleet product versions before 4.87.0. The device API improperly accepts non-secret identifiers (hostnames and hardware serials) as valid authentication tokens in addition to device UUIDs. This flaw allows unauthenticated attackers to impersonate iOS/iPadOS hosts if they can guess or know these identifiers, leading to unauthorized access to device data and the ability to perform device-scoped actions including software installation and MDM migration.
Potential Impact
An unauthenticated attacker can bypass authentication controls by using non-secret identifiers, gaining unauthorized access to sensitive device data and the ability to perform privileged actions on iOS/iPadOS hosts. This could lead to significant compromise of managed devices and their configurations.
Mitigation Recommendations
A fix is available in fleet version 4.87.0. Users should upgrade to version 4.87.0 or later to remediate this vulnerability.
CVE-2026-103264: Improper Authentication in fleetdm fleet
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.
CVSS v4.0
Score 9.3critical
Affected software
fleetdm
fleet
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-103264 describes an authentication bypass vulnerability in fleetdm's fleet product versions before 4.87.0. The device API improperly accepts non-secret identifiers (hostnames and hardware serials) as valid authentication tokens in addition to device UUIDs. This flaw allows unauthenticated attackers to impersonate iOS/iPadOS hosts if they can guess or know these identifiers, leading to unauthorized access to device data and the ability to perform device-scoped actions including software installation and MDM migration.
Potential Impact
An unauthenticated attacker can bypass authentication controls by using non-secret identifiers, gaining unauthorized access to sensitive device data and the ability to perform privileged actions on iOS/iPadOS hosts. This could lead to significant compromise of managed devices and their configurations.
Mitigation Recommendations
A fix is available in fleet version 4.87.0. Users should upgrade to version 4.87.0 or later to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-30T10:58:33.573Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abe7486a43b0b3b89bd1c46
Added to database: 10/01/2026, 14:56:06 UTC
Last enriched: 10/01/2026, 15:15:23 UTC
Last updated: 10/01/2026, 22:45:59 UTC
Views: 5
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