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    CVE-2026-66780

    A flaw was found in the submariner-operator component. The `submariner-k8s-broker-cluster` Role, which is assigned to joined clusters, possesses excessive permissions. This allows a compromised cluster to alter network configurations, specifically by overwriting other clusters' endpoint information. Consequently, an attacker can redirect inter-cluster tunnel traffic, enabling a Man-in-the-Middle (MITM) attack across the entire cluster mesh.

    Published:Aug 18, 2026
    Last Modified:Sep 3, 2026
    EPS:Aug 18, 2026
    EPSS Score:0.00241
    CVSS Score:6.5

    Affected Products

    Vendor
    Redhat
    Product
    Acm
    Vendor
    Redhat
    Product
    Advanced Cluster Management For Kubernetes

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-66786 (CVSS 9.1) — A flaw was found in submariner. In cert-auth mode, the connection configuration is built using free-form strin…
    CVE-2026-73137 (CVSS 7.7) — A flaw was found in the multicloud-operators-subscription component of Red Hat Advanced Cluster Management (RH…
    CVE-2026-67567 (CVSS 9.9) — A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a tenant, who h…
    CVE-2026-66788 (CVSS 3.7) — A flaw was found in Lighthouse. A remote attacker, by compromising a spoke cluster, can exploit a vulnerabilit…
    CVE-2026-66785 (CVSS 2.5) — A flaw was found in Submariner. This vulnerability allows a malicious cluster (spoke) to redirect network traf…
    CVE-2026-66787 (CVSS 5.4) — A flaw was found in the lighthouse component of Red Hat Advanced Cluster Management for Kubernetes. This vulne…
    CVE-2026-76827 (CVSS 6.8) — A flaw was found in search-indexer. This vulnerability allows a registered and authenticated managed cluster t…
    CVE-2026-76139 (CVSS 8) — A flaw was found in acm-operator-bundle. The build process for this component downloads and runs a script from…
    CVE-2026-18874 (CVSS 6.2) — A flaw was found in volsync-addon-controller. This vulnerability allows an attacker to inject malicious YAML (…

    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