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CVE-2026-66795— Managedcluster-import-controller: managedcluster-import-controller: csr auto-approver does not validate certificate subject, signername, or requester identity

CVSS 9.1 · Critical EPSS 0.22% · P12

Affected Version Matrix 1

VendorProductVersion RangeStatus
Red HatMulticluster Engine for Kubernetesanyaffected
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I. Basic Information for CVE-2026-66795

Vulnerability Information
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Vulnerability Title
Managedcluster-import-controller: managedcluster-import-controller: csr auto-approver does not validate certificate subject, signername, or requester identity
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat Multicluster Engine for Kubernetes 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat Multicluster Engine for Kubernetes是美国Red Hat公司的一个管理Kubernetes多集群的引擎软件。 Red Hat Multicluster Engine for Kubernetes存在加密问题漏洞，该漏洞源于证书签名请求（CSR）自动批准逻辑验证不当，未检查签名者名称或解码PEM编码的x509 CSR，可能导致特权服务账户提交恶意CSR，从而提升权限并获取hub集群的管理员凭据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Red HatMulticluster Engine for Kubernetes-cpe:/a:redhat:multicluster_engine

II. Public POCs for CVE-2026-66795

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III. Intelligence Information for CVE-2026-66795

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Vendor Advisories for CVE-2026-66795 (2)

Same Patch Batch · Red Hat · 2026-08-17 · 5 CVEs total

CVE-2026-667929.9 CRITICALMulticloud-operators-subscription: multicloud-operators-subscription: isclusteradmin() tru
CVE-2026-714729.1 CRITICALAcm-search-v2-rhel9: search-v2-operator: shell-command and sql injection in postgresql-sta
CVE-2026-704958.8 HIGHSearch-v2-operator: search-v2-operator: cluster-wide impersonate on users/groups shared ac
CVE-2026-152187.9 HIGHModels-as-a-service: red hat openshift ai: maas-api and maas-controller serviceaccounts wi

IV. Related Vulnerabilities

Same product: Multicluster Engine for Kubernetes
Same vendor: Red Hat
Same weakness: CWE-295

V. Comments for CVE-2026-66795

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