What is CVE-2026-42999?

CVE-2026-42999 is a medium-severity vulnerability in Openstack Keystone, classified under Incorrect Authorization. CVSS score: 6.0/10. Published 2026-05-28.

How severe is CVE-2026-42999?

Medium severity. CVSS v3 base score is 6.0 out of 10.

Auth bypass in Openstack Keystone

CVE-2026-42999

An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone RBAC policy enforcer in enforce_call unconditionally merges the raw JSON request body into the policy enforcement dictionary via policy_dict.update(json_input.copy()…

Vulnerability class: Broken Access Control

EPSS: 0.000 (12.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L.

Affected products

Openstack Keystone — versions 14.0.0, 28.0.0, 29.0.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

cve@mitre.org (Exploit, Patch, Third Party Advisory, Issue Tracking)
cve@mitre.org (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42999?: CVE-2026-42999 is a medium-severity vulnerability in Openstack Keystone, classified under Incorrect Authorization. CVSS score: 6.0/10. Published 2026-05-28.
How severe is CVE-2026-42999?: Medium severity. CVSS v3 base score is 6.0 out of 10.