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 c…
High CVSS 8.2
Summary
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.
In-depth triage · Auto channel
No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).
Affected products
- :
Lint boundary warnings (1)
The following non-blocking warnings were raised during the lint phase of this triage (e.g. reference URLs not yet on the allowlist). They do not affect entry usability and are disclosed for transparency (see DR-002).
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REF_URL_NOT_ALLOWLISTEDurl not in allowlist: https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape/
Sources
- NVD DATABASE
Original Links
- https://access.redhat.com/security/cve/CVE-2026-4740 Vendor Advisory
- https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape/ Exploit
- https://bugzilla.redhat.com/show_bug.cgi?id=2450590 Issue Tracking
- https://access.redhat.com/security/cve/CVE-2026-4740 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2450590 Issue Tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4740.json
Timeline
- nvd_ingest NVD