What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-26 · updated 2026-09-28
• Weakness: CWE-441

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

• kyverno: before 1.19.1 — fixed in 1.19.1

How to fix

Upgrade to a fixed version: kyverno 1.19.1. Check the vendor advisory for mitigations.

References

• https://github.com/kyverno/kyverno/security/advisories/GHSA-5qq8-67g6-4h2w
• https://www.vulncheck.com/advisories/kyverno-before-1.19.1-privilege-escalation-via-policy-apicall-urlpath

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