Red Hat Multicluster Global Hub 1.7.3

• CVE-2026-71577 Medium 6.3 Multicluster-global-hub: multicluster-global-hub: spec-topic read acl leaks bootstrap kubeconfigs to all managed hubs during migration 0.4%
• CVE-2026-71576 High 8.5 Multicluster-global-hub: multicluster-global-hub: manager trusts self-asserted evt.source() for leaf-hub identity in all status handlers 0.3%