Multicluster Global Hub
Monthly
Unauthenticated Go pprof debug endpoints exposed on the postgres-exporter metrics listener let any attacker who can reach that port from inside the cluster network read process arguments, full goroutine stacks, and heap memory - potentially leaking database connection strings and credentials - and repeatedly trigger CPU profiling to exhaust resources in a denial-of-service condition. The flaw is tracked as CVE-2026-83550 (CVSS 7.1, AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H per the vendor, C:H for confidentiality in our assessment) and affects postgres-exporter as shipped in Red Hat Multicluster Global Hub, where the CPE covers all tracked versions; exploitation requires adjacent/cluster network reachability rather than internet exposure. No public exploit code has been identified at time of analysis, and no CISA KEV listing indicates active exploitation; risk is best characterized as a real design flaw of moderate priority, with exposure materially reducible through NetworkPolicies that restrict access to the metrics port.
Privilege escalation in Red Hat Advanced Cluster Management's multicloud-operators-subscription controller lets a low-privileged user on a managed cluster create a Subscription with crafted annotations that the controller processes with its own elevated Service Account, deploying attacker-chosen resources into arbitrary namespaces. The flaw (CWE-863, CVSS 9.9, scope-changed) affects Red Hat ACM 2.x and Multicluster Global Hub as reported by Red Hat. There is no public exploit identified at time of analysis and it is not listed in CISA KEV.
Insufficient source identity validation in Red Hat Multicluster Global Hub's manager component allows a network-adjacent attacker who has compromised a managed hub to impersonate any other hub on the shared Kafka status bus. By presenting a legitimately obtained Kafka client certificate from the compromised hub while falsifying the CloudEvent source field, the attacker can overwrite or delete compliance records, inventory data, and cluster health telemetry belonging to sibling hubs in the shared database. No public exploit has been identified at time of analysis, but the scope-changed CVSS vector (S:C) reflects that the integrity impact extends beyond the initially compromised hub to the entire multi-hub management plane.
Red Hat multicluster-global-hub misconfigures topic-level access controls during ManagedClusterMigration, exposing bootstrap kubeconfigs - containing API server tokens - to any managed hub that reads the shared communication topic. A compromised managed hub can silently harvest these credentials, which carry an approximately 9.86-year validity window, enabling long-lived unauthorized access to other managed clusters well beyond the migration event itself. No public exploit has been identified at time of analysis, but the extended token lifetime dramatically amplifies post-compromise dwell risk.
Unauthenticated Go pprof debug endpoints exposed on the postgres-exporter metrics listener let any attacker who can reach that port from inside the cluster network read process arguments, full goroutine stacks, and heap memory - potentially leaking database connection strings and credentials - and repeatedly trigger CPU profiling to exhaust resources in a denial-of-service condition. The flaw is tracked as CVE-2026-83550 (CVSS 7.1, AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H per the vendor, C:H for confidentiality in our assessment) and affects postgres-exporter as shipped in Red Hat Multicluster Global Hub, where the CPE covers all tracked versions; exploitation requires adjacent/cluster network reachability rather than internet exposure. No public exploit code has been identified at time of analysis, and no CISA KEV listing indicates active exploitation; risk is best characterized as a real design flaw of moderate priority, with exposure materially reducible through NetworkPolicies that restrict access to the metrics port.
Privilege escalation in Red Hat Advanced Cluster Management's multicloud-operators-subscription controller lets a low-privileged user on a managed cluster create a Subscription with crafted annotations that the controller processes with its own elevated Service Account, deploying attacker-chosen resources into arbitrary namespaces. The flaw (CWE-863, CVSS 9.9, scope-changed) affects Red Hat ACM 2.x and Multicluster Global Hub as reported by Red Hat. There is no public exploit identified at time of analysis and it is not listed in CISA KEV.
Insufficient source identity validation in Red Hat Multicluster Global Hub's manager component allows a network-adjacent attacker who has compromised a managed hub to impersonate any other hub on the shared Kafka status bus. By presenting a legitimately obtained Kafka client certificate from the compromised hub while falsifying the CloudEvent source field, the attacker can overwrite or delete compliance records, inventory data, and cluster health telemetry belonging to sibling hubs in the shared database. No public exploit has been identified at time of analysis, but the scope-changed CVSS vector (S:C) reflects that the integrity impact extends beyond the initially compromised hub to the entire multi-hub management plane.
Red Hat multicluster-global-hub misconfigures topic-level access controls during ManagedClusterMigration, exposing bootstrap kubeconfigs - containing API server tokens - to any managed hub that reads the shared communication topic. A compromised managed hub can silently harvest these credentials, which carry an approximately 9.86-year validity window, enabling long-lived unauthorized access to other managed clusters well beyond the migration event itself. No public exploit has been identified at time of analysis, but the extended token lifetime dramatically amplifies post-compromise dwell risk.