Description
A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a tenant, who has the ability to create HelmRelease custom resources (CRs), to bypass existing security controls. The system's HelmRelease controller processes Helm chart templates using its own elevated ServiceAccount privileges without proper validation. This enables the tenant to deploy arbitrary resources across the entire cluster, leading to a significant security compromise.
Published: 2026-08-20
Score: 9.9 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

A vulnerability in the multicloud‑operators‑subscription component allows a tenant who can create HelmRelease custom resources to bypass existing security controls. The HelmRelease controller processes chart templates using its own elevated ServiceAccount privileges without proper validation, giving the tenant the ability to deploy arbitrary resources throughout the cluster. The consequences are an unrestricted ability to modify cluster‑wide configuration, which can lead to complete compromise of confidentiality, integrity, and availability.

Affected Systems

Red Hat Advanced Cluster Management for Kubernetes 2 is affected by this flaw. Tenants who can create HelmRelease resources in this environment risk exploiting the issue; any user or service account with such capability is a potential attacker.

Risk and Exploitability

The flaw is scored CVSS 9.9, indicating critical severity. An attacker can gain cluster‑wide deployment power without needing additional credentials. The EPSS score is not available, and the vulnerability is not listed in CISA’s KEV catalog, but the lack of validation and the high score suggest that exploitation is feasible and could have grave impact if left unmitigated. The likely attack vector is through the creation of a malicious HelmRelease object by an authenticated, yet untrusted tenant.

Generated by OpenCVE AI on August 21, 2026 at 01:18 UTC.

Remediation

Vendor Workaround

To mitigate this issue, restrict the ability of untrusted tenants to create `HelmRelease` custom resources within the cluster. Implement strict Role-Based Access Control (RBAC) policies to limit which users or service accounts can create or modify `HelmRelease` objects. This will prevent unauthorized users from leveraging the controller's elevated privileges for cluster-wide resource deployment.

OpenCVE Recommended Actions

  • Enforce strict Role‑Based Access Control to prevent untrusted tenants from creating or modifying HelmRelease custom resources. Only allow trusted service accounts or users to create these objects.
  • Audit the cluster for existing HelmRelease objects and promptly delete any that were created by untrusted tenants.
  • Contact Red Hat for an updated version of Advanced Cluster Management for Kubernetes 2 that includes a fix for this issue.

Generated by OpenCVE AI on August 21, 2026 at 01:18 UTC.

Tracking

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Advisories

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History

Thu, 27 Aug 2026 04:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:acm:2.11::el9
cpe:/a:redhat:acm:2.14::el9
cpe:/a:redhat:acm:2.16::el9
References

Wed, 26 Aug 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 26 Aug 2026 22:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:acm:2 cpe:/a:redhat:acm:2.13::el9
cpe:/a:redhat:acm:2.15::el9
cpe:/a:redhat:acm:2.17::el9
References

Fri, 21 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat advanced Cluster Management For Kubernetes
Vendors & Products Redhat advanced Cluster Management For Kubernetes

Thu, 20 Aug 2026 20:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a tenant, who has the ability to create HelmRelease custom resources (CRs), to bypass existing security controls. The system's HelmRelease controller processes Helm chart templates using its own elevated ServiceAccount privileges without proper validation. This enables the tenant to deploy arbitrary resources across the entire cluster, leading to a significant security compromise.
Title Multicloud-operators-subscription: multicloud-operators-subscription: helmrelease chart applied with controller sa without gvk or namespace restriction
First Time appeared Redhat
Redhat acm
Weaknesses CWE-441
CPEs cpe:/a:redhat:acm:2
Vendors & Products Redhat
Redhat acm
References
Metrics cvssV3_1

{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}

Subscriptions

Redhat Acm Advanced Cluster Management For Kubernetes
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-05T14:23:52.281Z

Reserved: 2026-08-11T17:40:07.959Z

Link: CVE-2026-67567

cve-icon Vulnrichment

Updated: 2026-08-21T16:20:33.218Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-20T21:17:07.403

Modified: 2026-08-28T21:17:10.720

Link: CVE-2026-67567

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-21T13:00:45Z

Weaknesses
  • CWE-441

    Unintended Proxy or Intermediary ('Confused Deputy')