23 Oct 2026 15:48:27 UTC
Managedcluster-import-controller: csr auto-approver does not validate certificate subject or signername (spoke→hub cluster-admin)
cve-program · CVE-2026-66795 · Published
CVE-2026-66795
multicluster engine for Kubernetes 2.10 · Vulnerability
CVSS 3.1 9.9 CRITICALCheck source for fixed versionsKEV status unknown
Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
cve-program · CVE-2026-66795
PublishedA 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.
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