CVE-2026-41323

HIGH

Kyverno: ServiceAccount token leaked to external servers via apiCall service URL

Title source: cna
STIX 2.1

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.

References (4)

Core 4

Scores

CVSS v3 8.1
EPSS 0.0056
EPSS Percentile 42.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-200 CWE-918
Status published
Products (4)
kyverno/kyverno < 1.16.4 (2 CPE variants)
kyverno/kyverno 0 - 1.17.0Go
kyverno/kyverno 1.17.0 - 1.17.2
kyverno/kyverno >= 1.17.0-rc1, < 1.17.2-rc1
Published Apr 24, 2026
Tracked Since Apr 24, 2026