Vulnerability · Published Apr 24, 2026 · Assigned by GitHub_M

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

High 8.1

In plain English

A high-severity information exposure in kyverno from kyverno. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.6%top 53.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/kyverno/kyverno	1.17.0	GHSA-f9g8-6ppc-pqq4
Go	github.com/kyverno/kyverno	1.17.0	GO-2026-5351

Affected products (as reported)

Vendor	Product	Versions
kyverno	kyverno	< 1.16.4>= 1.17.0-rc1, < 1.17.2-rc1

Weakness: CWE-200, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

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