Auth bypass in Kyverno
CVE-2026-122316
Kyverno from 1.17.0 before 1.19.2 contains a missing authorization vulnerability in the mutate-existing background processor that allows namespaced tenants to modify resources outside their namespace. Attackers can create a NamespacedMutatingPolicy targeting Namespace objects or victim-namespace resources via CEL expressions, making the background-controller ServiceAccount strip Pod Security labels cluster-wide.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/kyverno/kyverno/security/advisories/GHSA-vm98-8c25-h274 (vendor-advisory)
- www.vulncheck.com/advisories/kyverno-1.17.0-before-1.19.2-cross-namespace-write… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-122316?
- CVE-2026-122316 is a high-severity vulnerability in Kyverno, classified under Missing Authorization. CVSS score: 8.5/10. Published 2026-11-05.
- How severe is CVE-2026-122316?
- High severity. CVSS v3 base score is 8.5 out of 10.