What’s Vulnerable › Vulnerabilities

CVE-2026-41323: Kyverno: ServiceAccount token leaked to external servers via apiCall service URL

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-24 · updated 2026-06-17
• Weakness: CWE-200

Description

Kyverno is a policy engine designed for cloud native platform engineering teams. Prior to versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4, 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. Versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4 patch the issue.

Affected products

• kyverno: before 1.16.4; from 1.17.0 before 1.17.2 — fixed in 1.16.4, 1.17.2

How to fix

Upgrade to a fixed version: kyverno 1.16.4, 1.17.2. Check the vendor advisory for mitigations.

References

• https://github.com/kyverno/kyverno/commit/bc4f91c4801b1eaa2edc0a14e2f1b0af8cf0c1f5
• https://github.com/kyverno/kyverno/commit/c2eab00033e635bda4e4efb58c1b472b41728bb6
• https://github.com/kyverno/kyverno/commit/f70e8ac1e7acd2e3844f9553e4a884f07f953de0
• https://github.com/kyverno/kyverno/security/advisories/GHSA-f9g8-6ppc-pqq4
• https://github.com/kyverno/kyverno/security/advisories/GHSA-f9g8-6ppc-pqq4

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