CVE-2026-126402

EUVD-2026-125163
Fleet before 4.89.0 contains an incorrect authorization flaw in its user administration API that accepts user creation or modification when the caller administers any one of the assigned teams. Authenticated team administrators can grant users administrator roles on other teams, then deploy software and execute scripts on those teams' hosts.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
7.2 HIGH
NETWORK
LOW
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 42.68%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
fleetdmfleet
𝑥
< 4.89.0
CNA
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://github.com/fleetdm/fleet/security/advisories/GHSA-mj9p-fq5h-mw8h
https://www.vulncheck.com/advisories/fleet-before-4.89.0-broken-access-control-via-user-administration-api