GHSA-f9g8-6ppc-pqq4
High · 8.1Kyverno: ServiceAccount token leaked to external servers via apiCall service URL
CVSS
8.1
EPSS
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Published
Apr 16, 2026
CISA due date
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The record
Kyverno's apiCall feature in ClusterPolicy automatically attaches the admission controller's ServiceAccount token to outgoing HTTP requests. The service URL has no validation — it can point anywhere, including attacker-controlled servers. Since the admission controller SA has permissions to patch webhook configurations, a stolen token leads to full cluster compromise.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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