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CVE-2026-66795 is a critical vulnerability in Red Hat OpenShift Multicluster Engine's managedcluster-import-controller. The flaw involves improper validation of Certificate Signing Requests (CSRs) in the auto-approval logic, specifically failing to inspect the signer name or decode the PEM-encoded x509 CSR. This allows a privileged service account on a spoke cluster to submit a malicious CSR and escalate privileges to obtain administrative credentials on the hub cluster. No effective mitigation or patch is currently available that meets Red Hat's criteria for ease of use and stability.

The managedcluster-import-controller component of Red Hat OpenShift Multicluster Engine improperly validates incoming CSRs by not verifying the signer name or decoding the PEM-encoded x509 CSR. This vulnerability enables a privileged service account on a spoke cluster to submit a malicious CSR that can be auto-approved, leading to privilege escalation. Successful exploitation grants the attacker cluster-admin privileges on the hub cluster, compromising the security of the multicluster environment. The issue is tracked as CWE-295 (Improper Certificate Validation) and carries a CVSS 3.1 score of 9.9, indicating critical severity.

Detailed information about A flaw was found in the managedcluster-import-controller. (CVE-2026-66795). Get real-time updates, technical details, and mitigation 

A flaw was found in the managedcluster-import-controller. (CVE-2026-66795) - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-66795: Improper Certificate Validation in Red Hat multicluster engine for Kubernetes 2.10

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Threats Tagged 'ghsa-w9c6-w29v-4vp6'

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