CVE-2026-71577

Multicluster-global-hub: multicluster-global-hub: spec-topic read acl leaks bootstrap kubeconfigs to all managed hubs during migration

Published Aug 10, 2026 CVSS 3.1 · 6.3 Medium EPSS < 1% KEV · Not listed
Description
A flaw was found in multicluster-global-hub. During a ManagedClusterMigration, the system incorrectly grants all managed hubs read access to a shared communication topic. This allows a compromised managed hub to intercept and collect sensitive bootstrap kubeconfigs, which contain API server tokens intended for other hubs. These tokens have an extended validity of approximately 9.86 years, significantly increasing the risk of unauthorized access and information disclosure to other managed clusters.

Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:/a:redhat:multicluster_globalhub:1.5::el9
References
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
CPEs cpe:/a:redhat:multicluster_globalhub cpe:/a:redhat:multicluster_globalhub:1.4::el9
cpe:/a:redhat:multicluster_globalhub:1.7::el9
cpe:/a:redhat:multicluster_globalhub:1.8::el9
References
Type Values Removed Values Added
Description A flaw was found in multicluster-global-hub. During a ManagedClusterMigration, the system incorrectly grants all managed hubs read access to a shared communication topic. This allows a compromised managed hub to intercept and collect sensitive bootstrap kubeconfigs, which contain API server tokens intended for other hubs. These tokens have an extended validity of approximately 9.86 years, significantly increasing the risk of unauthorized access and information disclosure to other managed clusters.
Title Multicluster-global-hub: multicluster-global-hub: spec-topic read acl leaks bootstrap kubeconfigs to all managed hubs during migration
First Time appeared Redhat
Redhat multicluster Globalhub
Weaknesses CWE-522
CPEs cpe:/a:redhat:multicluster_globalhub
Vendors & Products Redhat
Redhat multicluster Globalhub
References
Metrics cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Sep 29, 2026, 5:21 PM
Reserved
Aug 7, 2026, 2:20 PM
Status
Awaiting Analysis
Published
Aug 10, 2026, 5:17 PM
Modified
Oct 24, 2026, 3:10 PM
Severity
Moderate
Public date
Aug 10, 2026, 2:38 PM