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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Multicluster Global Hub 1.4.9 | — | — |
| Red Hat | Multicluster Global Hub 1.5.8 | — | — |
| Red Hat | Multicluster Global Hub 1.6.6 | — | — |
| Red Hat | Multicluster Global Hub 1.7.3 | — | — |
| Red Hat | Multicluster Global Hub 1.8.2 | — | — |
References
- RHSA-2026:67516 vendor-advisory
- RHSA-2026:67842 vendor-advisory
- RHSA-2026:68515 vendor-advisory
- RHSA-2026:71597 vendor-advisory
- RHSA-2026:73038 vendor-advisory
- RHSA-2026:73419 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-71577 vdb-entry
- RHBZ#2512514 issue-tracking