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    CVE-2026-66801

    A flaw was found in multicluster-global-hub. An attacker who compromises a managed hub can leverage its legitimate Kafka client certificate to publish a CloudEvent (a specification for describing event data in a common way) message to the shared `gh-spec` topic. This message can spoof its source as "global-hub" and target other managed hubs. Due to a lack of binding between the Kafka client principal and the CloudEvent envelope, the agent on the targeted hub accepts this spoofed message and applies arbitrary resources. This vulnerability allows for fleet-wide cluster-admin privilege escalation across all managed hubs.

    Published:Aug 10, 2026
    Last Modified:Aug 10, 2026
    EPS:N/A
    EPSS Score:
    CVSS Score:9.9

    Affected Products

    Vendor
    Redhat
    Product
    Multicluster Globalhub

    Exploits

    No exploit reference

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    References

    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