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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
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.

在 Kubernetes 多集群引擎（Multicluster Engine for Kubernetes）的 组件中发现了一个安全漏洞。该漏洞允许未经身份验证的攻击者（只要能够访问面向用户的路由），绕过身份验证和授权检查。通过操纵 URL 路径段，攻击者可以将请求代理到任何受管集群中的任意服务。这使得攻击者能够未经授权使用内部服务，而这些服务原本受到保护，可能导致信息泄露或进一步破坏集群环境。

CVSS 9.3 · Critical EPSS 0.32% · P25

Affected Version Matrix 2

VendorProduct Version RangeStatus
Red Hat Multicluster Engine for Kubernetes any affected
any affected
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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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Multicluster Engine for Kubernetes - cpe:/a:redhat:multicluster_engine
Red Hat Multicluster Engine for Kubernetes - cpe:/a:redhat:multicluster_engine

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 (2)

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: mce-operator-bundle: bundle-generation business logic fetched from mu
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
Same vendor: Red Hat
Same weakness: CWE-918

V. Comments for CVE-2026-66794

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