9.9
Critical
CVE-2026-66795 A flaw was found in the managedcluster-import-controller
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Multicluster Engine for Kubernetes | Versions not published | |
| multicluster engine for Kubernetes 2.10 1787078272 | earliest → < 1787078272 | 1787078272 |
| multicluster engine for Kubernetes 2.11 1787078330 | earliest → < 1787078330 | 1787078330 |
| multicluster engine for Kubernetes 2.17 1786577915 | earliest → < 1786577915 | 1786577915 |
| multicluster engine for Kubernetes 2.6 1787260779 | earliest → < 1787260779 | 1787260779 |
| multicluster engine for Kubernetes 2.8 1787259044 | earliest → < 1787259044 | 1787259044 |
| multicluster engine for Kubernetes 2.9 1787078307 | earliest → < 1787078307 | 1787078307 |
| multicluster engine for Kubernetes 2.1 1787078272 | earliest → < 1787078272 | 1787078272 |
| multicluster engine for Kubernetes 2.9.0 1787078307 | earliest → < 1787078307 | 1787078307 |
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| Product | Affected versions | Fixed in |
|---|---|---|
| multicluster engine for Kubernetes 2.11.0 1787078330 | earliest → < 1787078330 | 1787078330 |
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