CVE-2026-66795
Managedcluster-import-controller: csr auto-approver does not validate certificate subject or signername (spoke→hub cluster-admin)
- State
- Published
- Severity
- 9.9 Critical
- Published
- Aug 17, 2026
- Updated
- Sep 29, 2026
- Reserved
- Jul 27, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.9 Critical | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | redhat |
Weaknesses
- CWE-295 Improper Certificate Validation
Affected Products
| Product | Versions |
|---|---|
multicluster engine for Kubernetes 2.10Red Hat |
|
multicluster engine for Kubernetes 2.11Red Hat |
|
multicluster engine for Kubernetes 2.17Red Hat |
|
multicluster engine for Kubernetes 2.6Red Hat |
|
multicluster engine for Kubernetes 2.8Red Hat |
|
multicluster engine for Kubernetes 2.9Red Hat |
|
References
- RHSA-2026:59556vendor-advisory
- RHSA-2026:59557vendor-advisory
- RHSA-2026:59558vendor-advisory
- RHSA-2026:59559vendor-advisory
- RHSA-2026:59579vendor-advisory
- RHSA-2026:59593vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-66795vdb-entry
- RHBZ#2507540issue-tracking
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