by Kastro
Paper/Archive/CVE-2026-100706

CVE-2026-100706

kyverno kyverno — kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath

EPSS 0.6%CVSS 9.9
critical.is priorityof 100
40
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 49.4.494 × 209.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
kyverno< 1.19.11.19.1CNA

Scores by source

VulnCheck (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
VulnCheck (CNA)9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

advisorygithub.com/kyverno/kyverno/security/advisories/GHSA-5qq8-67g6-4h2wwriteupvulncheck.com/advisories/kyverno-before-1.19.1-privilege-escalation-via-policy-apicall-urlpath