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Vulnerability · Published Aug 10, 2026 · Assigned by redhat

CVE-2026-71577Multicluster-global-hub: multicluster-global-hub: spec-topic read acl leaks bootstrap kubeconfigs to all managed hubs during migration

Medium 6.3

In plain English

A medium-severity security flaw in Multicluster Global Hub 1.4.9 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium
Exploit odds (30 days)0.4%top 63.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 (as reported)

VendorProductVersions
Red Hat Multicluster Global Hub 1.4.9 see references
Red Hat Multicluster Global Hub 1.5.8 see references
Red Hat Multicluster Global Hub 1.6.6 see references
Red Hat Multicluster Global Hub 1.7.3 see references
Red Hat Multicluster Global Hub 1.8.2 see references
Red Hat Multicluster Global Hub 1.8.2 see references

Weakness: CWE-522 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

References