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.
References8
- access.redhat.com/errata/RHSA-2026:67516
- access.redhat.com/errata/RHSA-2026:67842
- access.redhat.com/errata/RHSA-2026:68515
- access.redhat.com/errata/RHSA-2026:71597
- access.redhat.com/errata/RHSA-2026:73038
- access.redhat.com/errata/RHSA-2026:73419
- access.redhat.com/security/cve/CVE-2026-71577
- bugzilla.redhat.com/show_bug.cgi?id=2512514
Metrics
- CVSS 3.1
-
6.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - EPSS — exploit probability
- 0% percentile: 37 · as of 12 November 2026
- CWE
- CWE-522
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.