Description
A flaw was found in Open Cluster Management (OCM), the technology underlying Red Hat Advanced Cluster Management (ACM). Improper validation of Kubernetes client certificate renewal allows a managed cluster administrator to forge a client certificate that can be approved by the OCM controller. This enables cross-cluster privilege escalation and may allow an attacker to gain control over other managed clusters, including the hub cluster.
CVSS breakdown
CVSS 3.1
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected products
References
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:11414
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:13542
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:13853
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:8218
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:9848
- VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-4740
- MISChttps://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape/
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2450590
Updated 28m ago · 8 sources