Vulnerability details

CVE-2026-103264

fleetdm fleet

Fleet before 4.87.0 Authentication Bypass via Device Identifiers

CVSS 4.0

9.3Critical

Official 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 scores

Score	Version	Source	Vector
9.3Critical	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`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`
9.1Critical	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

Affected products

Vendor	Product	Versions	Source
fleetdm	fleet	v < 4.87.0	CVEProject cvelistV5 (CNA)

References and advisories

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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Details

Published: 2026-10-01
Last updated: 2026-10-01
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.31%

Probability of exploitation in 30 days

24%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-287
Improper Authentication