CVE-2026-71577

Summary

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 Software

VendorProductVersion RangeStatus
Red HatMulticluster Global Hub 1.4.91788355417 < *unaffected
Red HatMulticluster Global Hub 1.5.81789478830 < *unaffected
Red HatMulticluster Global Hub 1.7.31788372439 < *unaffected
Red HatMulticluster Global Hub 1.8.21788359461 < *unaffected

Weaknesses

  • CWE-522: Insufficiently Protected Credentials

Workarounds

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.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References