# CVE-2026-100706

Kyverno URL-encoding bug lets namespace users escalate to cluster-admin

- Page: https://www.vulneraibility.com/cve/CVE-2026-100706
- CVSS: 9.4
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.61% (percentile 49.7)
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-09-26)
- Weakness: CWE-441
- Also known as: GHSA-5qq8-67g6-4h2w
- Published: 2026-09-26

## Affected versions

- kyverno: affected < 1.19.1; fixed in 1.19.1

A version outside these ranges is not a statement that it is unaffected.

## Impact

Namespace tenants can create cluster-wide MutatingWebhookConfiguration or PolicyException via percent-encoded paths, achieving cluster-admin privilege escalation.

## Action

Immediate action required

## Recommendation

Upgrade to >=1.19.1; rotate service-account credentials; audit RBAC and webhooks

## References

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

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.