CVE-2026-71576: Multicluster-global-hub: multicluster-global-hub: manager trusts self-asserted evt.source() for leaf-hub identity in all status handlers

Severity: high (CVSS 8.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-10 · updated 2026-10-24
Weakness: CWE-345

Description

A flaw was found in multicluster-global-hub. The manager component improperly validates the source identity of incoming CloudEvents on Kafka status topics. A remote attacker, after compromising a managed hub and obtaining its Kafka client certificate, can manipulate the self-asserted source identity. This allows the attacker to falsify or delete critical data, such as compliance, inventory, and cluster health information, belonging to other hubs in the database.

Affected products

Red Hat Multicluster Global Hub 1.4.9: all versions — fixed in 1788355599
Red Hat Multicluster Global Hub 1.5.8: all versions — fixed in 1789515288
Red Hat Multicluster Global Hub 1.6.6: all versions — fixed in 1790086176
Red Hat Multicluster Global Hub 1.7.3: all versions — fixed in 1788377424
Red Hat Multicluster Global Hub 1.8.2: all versions — fixed in 1788359454

How to fix

Upgrade to a fixed version: Red Hat Multicluster Global Hub 1.4.9 1788355599; Red Hat Multicluster Global Hub 1.5.8 1789515288; Red Hat Multicluster Global Hub 1.6.6 1790086176; Red Hat Multicluster Global Hub 1.7.3 1788377424; Red Hat Multicluster Global Hub 1.8.2 1788359454. Check the vendor advisory for mitigations.

References

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