Vulnerability · Published Sep 26, 2026 · Assigned by VulnCheck

CVE-2026-100706kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath

Critical 9.9

In plain English

A critical-severity security flaw in kyverno from kyverno. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical

Exploit odds (30 days)0.6%top 50.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespaces as the admission-controller ServiceAccount. Attackers can exploit this by using percent-encoded directory traversal sequences to create MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, enabling privilege escalation to cluster admin.

Affected products (as reported)

Vendor	Product	Versions
kyverno	kyverno	0 – before 1.19.1

Weakness: CWE-441 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-5qq8-67g6-4h2w) vendor-advisory
VulnCheck Advisory: kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath third-party-advisory