CVE-2026-66795criticalCWE-295

CVE-2026-66795: critical vulnerability in Red Hat multicluster engine for Kubernetes 2.10

Managedcluster-import-controller: csr auto-approver does not validate certificate subject or signername (spoke→hub cluster-admin)

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28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.9epss 0.5%
A flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval logic improperly validates incoming CSRs, specifically by not inspecting the signer name or decoding the PEM-encoded x509 CSR. This vulnerability allows a privileged service account on a spoke cluster to submit a malicious CSR. Successful exploitation can lead to privilege escalation, enabling the attacker to obtain administrative credentials on the hub cluster.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
Red Hat · multicluster engine for Kubernetes 2.10Red Hat · multicluster engine for Kubernetes 2.11Red Hat · multicluster engine for Kubernetes 2.17Red Hat · multicluster engine for Kubernetes 2.6Red Hat · multicluster engine for Kubernetes 2.8Red Hat · multicluster engine for Kubernetes 2.9
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