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.
Metrics
CVSS 3.1 9.9/10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HWeakness enumeration
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| 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
- https://access.redhat.com/errata/RHSA-2026:59556
- https://access.redhat.com/errata/RHSA-2026:59557
- https://access.redhat.com/errata/RHSA-2026:59558
- https://access.redhat.com/errata/RHSA-2026:59559
- https://access.redhat.com/errata/RHSA-2026:59579
- https://access.redhat.com/errata/RHSA-2026:59593
- https://access.redhat.com/security/cve/CVE-2026-66795
- https://bugzilla.redhat.com/show_bug.cgi?id=2507540
Timeline
- Published
- Aug 17, 2026
- Last modified
- Sep 29, 2026
- NVD status
- Awaiting Analysis