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CVE-2026-17107— Cluster-proxy: impersonation-header injection grants cluster-admin on every managed cluster

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.

Red Hat Multicluster Engine for Kubernetes是美国Red Hat公司的容器编排与管理平台。 Red Hat multicluster engine for kubernetes存在服务端请求伪造漏洞，该漏洞源于service-proxy组件在代理请求时未移除调用者提供的模拟组标头，且spoke ServiceAccount拥有无限制模拟权限，导致认证的hub主体可注入Impersonate-Group标头，从而在每个受管集群上升级为集群管理员。

CVSS 8.5 · High EPSS 0.57% · P45

Affected Version Matrix 7

VendorProduct Version RangeStatus
Red Hat multicluster engine for Kubernetes 2.10 1784342329< * unaffected
1784342329< * unaffected
Red Hat multicluster engine for Kubernetes 2.11 1784925025< * unaffected
Red Hat multicluster engine for Kubernetes 2.17 1784926298< * unaffected
Red Hat multicluster engine for Kubernetes 2.6 1783985960< * unaffected
Red Hat multicluster engine for Kubernetes 2.8 1784342329< * unaffected
Red Hat multicluster engine for Kubernetes 2.9 1783278220< * unaffected
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I. Basic Information for CVE-2026-17107

Vulnerability Information
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Vulnerability Title
Cluster-proxy: impersonation-header injection grants cluster-admin on every managed cluster
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced Cluster Management for Kubernetes (RHACM) and multicluster-engine (MCE). The service-proxy appends impersonation group headers to proxied requests without first removing caller-supplied values, and the spoke ServiceAccount holds unrestricted impersonation permissions. An authenticated hub principal can inject an Impersonate-Group header to escalate to cluster-admin on every managed cluster.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未有动机的代理或中间人(混淆代理)
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat Multicluster Engine for Kubernetes 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat Multicluster Engine for Kubernetes是美国Red Hat公司的容器编排与管理平台。 Red Hat multicluster engine for kubernetes存在服务端请求伪造漏洞，该漏洞源于service-proxy组件在代理请求时未移除调用者提供的模拟组标头，且spoke ServiceAccount拥有无限制模拟权限，导致认证的hub主体可注入Impersonate-Group标头，从而在每个受管集群上升级为集群管理员。
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 1784342329 ~ * cpe:/a:redhat:multicluster_engine:2.10::el9
Red Hat multicluster engine for Kubernetes 2.10 1784342329 ~ * cpe:/a:redhat:multicluster_engine:2.10::el9
Red Hat multicluster engine for Kubernetes 2.11 1784925025 ~ * cpe:/a:redhat:multicluster_engine:2.11::el9
Red Hat multicluster engine for Kubernetes 2.17 1784926298 ~ * cpe:/a:redhat:multicluster_engine:2.17::el9
Red Hat multicluster engine for Kubernetes 2.6 1783985960 ~ * cpe:/a:redhat:multicluster_engine:2.6::el9
Red Hat multicluster engine for Kubernetes 2.8 1784342329 ~ * cpe:/a:redhat:multicluster_engine:2.8::el9
Red Hat multicluster engine for Kubernetes 2.9 1783278220 ~ * cpe:/a:redhat:multicluster_engine:2.9::el9

II. Public POCs for CVE-2026-17107

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III. Intelligence Information for CVE-2026-17107

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Vendor Advisories for CVE-2026-17107 (9)

Same Patch Batch · Red Hat · 2026-07-24 · 10 CVEs total

CVE-2026-66337 6.5 MEDIUM Libsoup: libsoup: heap buffer over-read via integer underflow in soup_filter_input_stream_
CVE-2026-66339 6.5 MEDIUM Libsoup: libsoup: proxy credentials leak to destination server via proxy-authorization hea
CVE-2026-17059 6.5 MEDIUM Keycloak-services: keycloak-services: information disclosure via role-users endpoint bypas
CVE-2026-17048 5.5 MEDIUM Keycloak-services: keycloak-services: vault-resolved rotated client secrets leaked via adm
CVE-2026-16743 5.5 MEDIUM Accountsservice: accountsservice: arbitrary file read via seticonfile for systemd-homed us
CVE-2026-16730 5.5 MEDIUM Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup
CVE-2026-16910 5.5 MEDIUM Quay: ssrf in red hat quay notification webhooks (slack/generic)
CVE-2026-66338 5.4 MEDIUM Libsoup: libsoup: http request smuggling via permissive chunk-size parsing in soup_body_in
CVE-2026-17039 3.1 LOW Pki-core: dogtag-pki: redhat-pki: pki-core: ca renewal request processing omits realm auth

IV. Related Vulnerabilities

Same product: multicluster engine for Kubernetes 2.10
Same vendor: Red Hat
Same weakness: CWE-441

V. Comments for CVE-2026-17107

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