Is Kyverno affected by EUVD-2026-25389?

Kyverno versions prior to 1.18.0-rc1, 1.17.2-rc1, and 1.16.4 contain an authentication token exfiltration vulnerability in the apiCall feature that allows authenticated cluster users to steal the admission controller's ServiceAccount token and achieve full cluster compromise.

Kyverno EUVD-2026-25389

| CVE-2026-41323 HIGH

Information Exposure (CWE-200)

2026-04-24 GitHub_M

GHSA-f9g8-6ppc-pqq4

Information Disclosure Suse

8.1

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Re-analysis Queued

Apr 24, 2026 - 12:22 vuln.today

cvss_changed

Patch available

Apr 24, 2026 - 05:31 EUVD

Analysis Generated

Apr 24, 2026 - 04:30 vuln.today

DescriptionNVD

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.

AnalysisAI

Kyverno's apiCall feature automatically attaches the admission controller's ServiceAccount token to HTTP requests without validating the destination URL, enabling authenticated attackers to exfiltrate tokens to attacker-controlled servers and achieve full cluster compromise through webhook configuration tampering. Affects Kyverno versions prior to 1.18.0-rc1, 1.17.2-rc1, and 1.16.4. …

RemediationAI

Within 24 hours: Inventory all Kyverno deployments and identify version numbers; isolate or restrict network egress from Kyverno pods to prevent token exfiltration. Within 7 days: Apply vendor-released patches-upgrade to Kyverno 1.18.0-rc1 or later, 1.17.2-rc1 or later, or 1.16.4 or later depending on your current branch. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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Vendor StatusVendor

EUVD-2026-25389 vulnerability details – vuln.today

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