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

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Summary

CVECVE-2026-41323
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 04:16:20 UTC
Updated2026-04-27 17:53:22 UTC
DescriptionKyverno 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.000210000 probability, percentile 0.058800000 (date 2026-04-27)

Problem Types: CWE-200 | CWE-918 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Kyverno Kyverno All All All All
Application Kyverno Kyverno All - All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Kyverno Kyverno affected < 1.16.4 Not specified
CNA Kyverno Kyverno affected >= 1.17.0-rc1, < 1.17.2-rc1 Not specified

References

ReferenceSourceLinkTags
github.com/kyverno/kyverno/commit/f70e8ac1e7acd2e3844f9553e4a884f07f953de0 [email protected] github.com Patch
github.com/kyverno/kyverno/security/advisories/GHSA-f9g8-6ppc-pqq4 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Vendor Advisory, Exploit
github.com/kyverno/kyverno/commit/bc4f91c4801b1eaa2edc0a14e2f1b0af8cf0c1f5 [email protected] github.com Patch
github.com/kyverno/kyverno/commit/c2eab00033e635bda4e4efb58c1b472b41728bb6 [email protected] github.com Patch
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