GHSA-fmqp-4wfc-w3v7
High · 7.7Kyverno APICall SSRF Vulnerability Leading to Multi-Tenant Isolation Breach
CVSS
7.7
EPSS
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Published
Apr 14, 2026
CISA due date
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The record
Kyverno's APICall feature contains a Server-Side Request Forgery (SSRF) vulnerability that allows users with Policy creation permissions to access arbitrary internal resources through Kyverno's high-privilege ServiceAccount. In multi-tenant Kubernetes environments, this constitutes a classic Confused Deputy problem: low-privilege tenants can steal sensitive data from other tenants (such as database passwords and API keys) and cloud platform IAM credentials, completely breaking tenant isolation. This vulnerability does not require cluster-admin privileges and can be exploited with only namespace-level Policy creation permissions.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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