by Kastro
Paper/Archive/CVE-2026-122310

CVE-2026-122310

kyverno kyverno — Kyverno 1.19.1 before 1.19.2 Privilege Escalation via Policy apiCall urlPath

CVSS 9.9
critical.is priorityof 100
30
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

Kyverno from 1.19.1 before 1.19.2 validates a Policy's context.apiCall urlPath after cleaning it but executes the raw path, whose fragment or query the Kubernetes client discards. A namespace-scoped user who can create a Policy can hide ../ segments behind # or ? to reach cluster-scoped endpoints with Kyverno's ServiceAccount, gaining cluster admin.

Affected

ProductAffectedFixed inSource
kyverno1.19.1 – < 1.19.21.19.2CNA

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

References

advisorygithub.com/kyverno/kyverno/security/advisories/GHSA-3xfv-vq8x-qhg4writeupvulncheck.com/advisories/kyverno-1.19.1-before-1.19.2-privilege-escalation-via-policy-apicall-urlpath