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CVE-2026-73266— Clusterclaims-controller: confused deputy: tenant-controlled clusterclaim labels propagated to managedcluster, enabling cross-tenant managedclusterset join

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.

Stolostron clusterclaims-controller是Stolostron组织的一款企业云平台的集群声明控制器。 Stolostron clusterclaims-controller存在服务端请求伪造漏洞，该漏洞源于对ClusterClaim标签的操纵，可能导致已认证租户强制集群加入另一租户的ManagedClusterSet，从而注入策略和工作负载到其他租户集群。

CVSS 7.1 · High EPSS 0.35% · P27

Affected Version Matrix 6

VendorProduct Version RangeStatus
Red Hat multicluster engine for Kubernetes 2.10 1787196014< * unaffected
Red Hat multicluster engine for Kubernetes 2.11 1787239442< * unaffected
Red Hat multicluster engine for Kubernetes 2.17 1786577950< * unaffected
Red Hat multicluster engine for Kubernetes 2.6 1787259112< * unaffected
Red Hat multicluster engine for Kubernetes 2.8 1787259059< * unaffected
Red Hat multicluster engine for Kubernetes 2.9 1787195995< * unaffected
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I. Basic Information for CVE-2026-73266

Vulnerability Information
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Vulnerability Title
Clusterclaims-controller: confused deputy: tenant-controlled clusterclaim labels propagated to managedcluster, enabling cross-tenant managedclusterset join
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized access could enable the injection of policies and workloads into other tenants' clusters.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
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
Stolostron clusterclaims-controller 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Stolostron clusterclaims-controller是Stolostron组织的一款企业云平台的集群声明控制器。 Stolostron clusterclaims-controller存在服务端请求伪造漏洞，该漏洞源于对ClusterClaim标签的操纵，可能导致已认证租户强制集群加入另一租户的ManagedClusterSet，从而注入策略和工作负载到其他租户集群。
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 1787196014 ~ * cpe:/a:redhat:multicluster_engine:2.10::el9
Red Hat multicluster engine for Kubernetes 2.11 1787239442 ~ * cpe:/a:redhat:multicluster_engine:2.11::el9
Red Hat multicluster engine for Kubernetes 2.17 1786577950 ~ * cpe:/a:redhat:multicluster_engine:2.17::el9
Red Hat multicluster engine for Kubernetes 2.6 1787259112 ~ * cpe:/a:redhat:multicluster_engine:2.6::el9
Red Hat multicluster engine for Kubernetes 2.8 1787259059 ~ * cpe:/a:redhat:multicluster_engine:2.8::el9
Red Hat multicluster engine for Kubernetes 2.9 1787195995 ~ * cpe:/a:redhat:multicluster_engine:2.9::el9

II. Public POCs for CVE-2026-73266

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III. Intelligence Information for CVE-2026-73266

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Vendor Advisories for CVE-2026-73266 (5)

Other References for CVE-2026-73266 (1)

Same Patch Batch · Red Hat · 2026-08-13 · 6 CVEs total

CVE-2026-73583 6.6 MEDIUM Sblim-sfcb: unsafe deserialization in sblim-sfcb provider-manager ipc allows out-of-bounds
CVE-2026-18728 6.5 MEDIUM Open-iscsi: open-iscsi: integer underflow in iscsiuio ipv4 dhcp parsing
CVE-2026-73585 6.3 MEDIUM Sblim-cmpi-base: insecure temporary file creation in sblim-cmpi-base provider registration
CVE-2026-73584 6.3 MEDIUM Sblim-sfcb: sblim-sfcb: privileged file corruption and denial of service via insecure temp
CVE-2026-19730 4.2 MEDIUM Podman: podman: quadlet install --replace non-truncating write retains removed host-access

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-73266

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