CVE-2026-41323
Kyverno: ServiceAccount token leaked to external servers via apiCall service URL
Description
Kyverno is a policy engine designed for cloud native platform engineering teams. Prior to versions 1.18.0, 1.17.2, 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, 1.17.2, and 1.16.4 patch the issue.
How to fix CVE-2026-41323
To remediate CVE-2026-41323, upgrade the affected package to a fixed version below.
- —upgrade to 1.16.4 or later
- —upgrade to 1.17.0 or later
Is CVE-2026-41323 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1.16.4, >= 1.17.0, < 1.17.2
- from 0, < 1.17.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |