CVE-2026-41323
Kyverno: ServiceAccount token leaked to external servers via apiCall service URL
CRITICAL 9.1EPSS 0.6%
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
- kyverno
- CVSS v3.1 NVD
- 9.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - CVSS v3.1 GITHUB
- 8.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - EPSS
- 0.57% chance of exploitation in the next 30 days, 46th percentile
- Published
- 2026-04-24
Proof-of-concept exploits (1)
Security advisories
- kyverno/kyverno/security/advisories/GHSA-f9g8-6ppc-pqq4
- kyverno/kyverno/commit/bc4f91c4801b1eaa2edc0a14e2f1b0af8cf0c1f5