Is CVE-2026-66795 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-66795?

CVE-2026-66795 has a CVSS v3 severity of CRITICAL (9.1).

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CVE-2026-66795

Description

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.