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CVE-2026-66794— Cluster-proxy-addon: cluster-proxy-addon: unauthenticated ssrf to arbitrary managed-cluster services via public route

Quick assessment

Affected
Red Hat multicluster engine for Kubernetes 2.10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open Cluster Management Cluster Proxy是Open Cluster Management组织的一个提供集群代理功能的组件。 Open Cluster Management Cluster Proxy 存在服务端请求伪造漏洞，该漏洞源于cluster-proxy-addon组件存在缺陷，允许未经身份验证的攻击者通过操纵URL路径段绕过认证和授权检查，将请求代理至任意服务，可能导致未授权访问内部服务，造成信息泄露或进一步破坏集群环境。

CVSS 9.3 · Critical EPSS 0.62% · P48

Affected Version Matrix 6

VendorProduct Version RangeStatus
Red Hat multicluster engine for Kubernetes 2.10 1787173361< * unaffected
Red Hat multicluster engine for Kubernetes 2.11 1787276784< * unaffected
Red Hat multicluster engine for Kubernetes 2.17 1786983349< * unaffected
Red Hat multicluster engine for Kubernetes 2.6 1787275318< * unaffected
Red Hat multicluster engine for Kubernetes 2.8 1787275519< * unaffected
Red Hat multicluster engine for Kubernetes 2.9 1787274923< * unaffected
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I. Basic Information for CVE-2026-66794

Vulnerability Information
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Vulnerability Title
Cluster-proxy-addon: cluster-proxy-addon: unauthenticated ssrf to arbitrary managed-cluster services via public route
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the `cluster-proxy-addon` component of Multicluster Engine for Kubernetes. This vulnerability allows an unauthenticated attacker, who can access the user-facing route, to bypass authentication and authorization checks. By manipulating URL path segments, the attacker can proxy requests to arbitrary services across any managed cluster. This enables unauthorized access to internal services that would otherwise be protected, potentially leading to information disclosure or further compromise of the cluster environment.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Open Cluster Management Cluster Proxy 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open Cluster Management Cluster Proxy是Open Cluster Management组织的一个提供集群代理功能的组件。 Open Cluster Management Cluster Proxy 存在服务端请求伪造漏洞，该漏洞源于cluster-proxy-addon组件存在缺陷，允许未经身份验证的攻击者通过操纵URL路径段绕过认证和授权检查，将请求代理至任意服务，可能导致未授权访问内部服务，造成信息泄露或进一步破坏集群环境。
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

Vendor Product Affected Versions CPE Subscribe
Red Hat multicluster engine for Kubernetes 2.10 1787173361 ~ * cpe:/a:redhat:multicluster_engine:2.10::el9
Red Hat multicluster engine for Kubernetes 2.11 1787276784 ~ * cpe:/a:redhat:multicluster_engine:2.11::el9
Red Hat multicluster engine for Kubernetes 2.17 1786983349 ~ * cpe:/a:redhat:multicluster_engine:2.17::el9
Red Hat multicluster engine for Kubernetes 2.6 1787275318 ~ * cpe:/a:redhat:multicluster_engine:2.6::el9
Red Hat multicluster engine for Kubernetes 2.8 1787275519 ~ * cpe:/a:redhat:multicluster_engine:2.8::el9
Red Hat multicluster engine for Kubernetes 2.9 1787274923 ~ * cpe:/a:redhat:multicluster_engine:2.9::el9

II. Public POCs for CVE-2026-66794

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III. Intelligence Information for CVE-2026-66794

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Vendor Advisories for CVE-2026-66794 (7)

Other References for CVE-2026-66794 (1)

Same Patch Batch · Red Hat · 2026-08-19 · 10 CVEs total

CVE-2026-70496 9.9 CRITICAL Search-v2-operator: search-v2-operator: operator clusterrole is cluster-admin equivalent v
CVE-2026-71470 9.1 CRITICAL Acm-search-v2-rhel9: search-v2-operator: search cr imageoverride/arguments/envvar flow uns
CVE-2026-76139 8.0 HIGH Acm-operator-bundle: acm-operator-bundle: bundle build execs unpinned stolostron/release@m
CVE-2026-75569 7.7 HIGH Mce-operator-bundle: all github actions pinned by mutable tag, not commit sha
CVE-2026-76235 7.5 HIGH Cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via cockpitlang cookie
CVE-2026-76827 6.8 MEDIUM Search-indexer: search-indexer: update/delete operations not scoped to caller's cluster (c
CVE-2026-18874 6.2 MEDIUM Volsync-addon-controller: volsync-addon-controller: annotation values rendered into yaml v
CVE-2026-75900 6.1 MEDIUM Swtpm: swtpm: out-of-bounds read in swtpm_nvram_checkheader due to sizeof(pointer) vs size
CVE-2026-76166 4.3 MEDIUM Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast

IV. Related Vulnerabilities

Same product: multicluster engine for Kubernetes 2.10
Same vendor: Red Hat
Same weakness: CWE-918

V. Comments for CVE-2026-66794

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