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    CVE-2026-73266

    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.

    Published:Aug 11, 2026
    Last Modified:Sep 2, 2026
    EPS:Aug 13, 2026
    EPSS Score:0.00215
    CVSS Score:7.1

    Affected Products

    Vendor
    Redhat
    Product
    Multicluster Engine
    Vendor
    Redhat
    Product
    Multicluster Engine For Kubernetes

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-219 XML Routing Detour Attacks
    CAPEC-465 Transparent Proxy Abuse

    Related CVEs

    CVE-2026-73267 (CVSS 7.7) — A flaw was found in the clusterclaims-controller component of multicluster engine (MCE). A tenant with standar…
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    CVE-2026-66794 (CVSS 9.3) — A flaw was found in the `cluster-proxy-addon` component of Multicluster Engine for Kubernetes. This vulnerabil…
    CVE-2026-75924 (CVSS 8.7) — A flaw was found in managed-serviceaccount. A compromised addon-manager pod, due to its ClusterRole granting e…
    CVE-2026-66795 (CVSS 9.9) — A flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval …
    CVE-2026-19130 (CVSS 5.8) — A flaw was found in the provider-credential-controller component of multicluster-engine (MCE). An attacker wit…
    CVE-2026-73268 (CVSS 9.9) — A flaw was found in the cluster-curator-controller component of multicluster engine (MCE). A tenant with creat…
    CVE-2026-73269 (CVSS 9.9) — A flaw was found in the cluster-curator-controller component. A local user, by creating a ClusterCurator resou…
    CVE-2026-10059 (CVSS 9.1) — A flaw was found in the Multicluster Engine for Kubernetes ClusterCurator controller. A tenant administrator w…
    CVE-2026-17107 (CVSS 8.5) — A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced Cluster Management for …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High