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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | multicluster engine for Kubernetes 2.10 | — | — |
| Red Hat | multicluster engine for Kubernetes 2.11 | — | — |
| Red Hat | multicluster engine for Kubernetes 2.17 | — | — |
| Red Hat | multicluster engine for Kubernetes 2.6 | — | — |
| Red Hat | multicluster engine for Kubernetes 2.8 | — | — |
| Red Hat | multicluster engine for Kubernetes 2.9 | — | — |
References
- RHSA-2026:59556 vendor-advisory
- RHSA-2026:59557 vendor-advisory
- RHSA-2026:59558 vendor-advisory
- RHSA-2026:59559 vendor-advisory
- RHSA-2026:59579 vendor-advisory
- RHSA-2026:59593 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-66795 vdb-entry
- RHBZ#2507540 issue-tracking