CVE-2026-126402

HIGH 7.2

Fleet before 4.89.0 Broken Access Control via User Administration API

CVSS Score

7.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-863
Vendor	fleetdm
Product	fleet
Published	Nov 13, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

fleetdm / fleet

0 < 4.89.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/fleetdm/fleet/security/advisories/GHSA-mj9p-fq5h-mw8h vulncheck.com: https://www.vulncheck.com/advisories/fleet-before-4.89.0-broken-access-control-via-user-administration-api