CVE-2026-67567Network attack vector

Tenant-to-cluster escalation via HelmRelease controller

Published Aug 20, 2026 · Updated Aug 20, 2026

Privilege escalation in Advanced Cluster Management for Kubernetes allows authenticated attackers to deploy cluster resources via HelmRelease CRs. The HelmRelease controller's NewManager() function builds Helm action.Configuration from the controller's own kubeconfig, then applies chart templates without impersonation, SubjectAccessReview, GVK filtering, or namespace coercion. Any tenant that can create a HelmRelease custom resource can use the controller's wildcard ServiceAccount to create cluster-scoped or cross-namespace objects across the cluster.

CVSS severity9.9
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Advanced Cluster Management for Kubernetes allows authenticated attackers to deploy cluster resources via HelmRelease CRs. The HelmRelease controller's NewManager() function builds Helm action.Configuration from the controller's own kubeconfig, then applies chart templates without impersonation, SubjectAccessReview, GVK filtering, or namespace coercion. Any tenant that can create a HelmRelease custom resource can use the controller's wildcard ServiceAccount to create cluster-scoped or cross-namespace objects across the cluster.

The record

CVE
CVE-2026-67567
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
389 Directory Server
Product
Red Hat Advanced Cluster Management for Kubernetes
Classifications
CWE-441, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat Advanced Cluster Management for KubernetesAffected versions are unavailable in this record.

Published CVSS scores

9.9Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-441Unintended Proxy or Intermediary ('Confused Deputy')
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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