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Fencer Vulns
medium 6.3

CVE-2026-71577 json

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

published 2026-08-10 2 mo ago modified 2026-10-24 16 d ago also EUVD-2026-55676

cvss
6.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

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.

Patch / fix

  • Red Hat Multicluster Global Hub 1.4.9 1788355417
  • Red Hat Multicluster Global Hub 1.5.8 1789478830
  • Red Hat Multicluster Global Hub 1.6.6 1790085268
  • Red Hat Multicluster Global Hub 1.7.3 1788372439
  • Red Hat Multicluster Global Hub 1.8.2 1788359461, 1790638386

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-71577 updated cvss 6.3

multicluster-global-hub: multicluster-global-hub: Spec-topic Read ACL leaks bootstrap kubeconfigs to all managed hubs during migration

  • Red Hat Multicluster Global Hub 1.4.9 multicluster-globalhub/multicluster-globalhub-rhel9-operator 1788355417
    fixed: vendor fix RHSA-2026:67516
  • Red Hat Multicluster Global Hub 1.5.8 multicluster-globalhub/multicluster-globalhub-rhel9-operator 1789478830
    fixed: vendor fix RHSA-2026:71597
  • Red Hat Multicluster Global Hub 1.6.6 multicluster-globalhub/multicluster-globalhub-rhel9-operator 1790085268
    fixed: vendor fix RHSA-2026:73419
  • Red Hat Multicluster Global Hub 1.7.3 multicluster-globalhub/multicluster-globalhub-rhel9-operator 1788372439
    fixed: vendor fix RHSA-2026:67842
  • Red Hat Multicluster Global Hub 1.8.2 multicluster-globalhub/multicluster-globalhub-rhel9-operator 1788359461, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1790638386
    fixed: vendor fix RHSA-2026:73038
  • Red Hat Multicluster Global Hub 1.4.9 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1788355439, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1788375682, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1788355599, multicluster-globalhub/multicluster-globalhub-operator-bundle 1788377695, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1788200958 Red Hat Multicluster Global Hub 1.5.8 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1789515408, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1789515639, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1789515288, multicluster-globalhub/multicluster-globalhub-operator-bundle 1789533983, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1789255903 Red Hat Multicluster Global Hub 1.6.6 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1790085494, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1790086248, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1790086176, multicluster-globalhub/multicluster-globalhub-operator-bundle 1790379995, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1790379115 Red Hat Multicluster Global Hub 1.7.3 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1788377473, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1788376193, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1788377424, multicluster-globalhub/multicluster-globalhub-operator-bundle 1788503575, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1788200952 Red Hat Multicluster Global Hub 1.8.2 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1788359470, multicluster-globalhub/multicluster-globalhub-agent-rhel9 1790638612, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1788441983, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1790639009, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1788359454, multicluster-globalhub/multicluster-globalhub-operator-bundle 1788496240, +3 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected products

  • Red Hat Multicluster Global Hub 1.4.9
  • Red Hat Multicluster Global Hub 1.5.8
  • Red Hat Multicluster Global Hub 1.6.6
  • Red Hat Multicluster Global Hub 1.7.3
  • Red Hat Multicluster Global Hub 1.8.2

Classification

Weakness
  • CWE-522 Insufficiently Protected Credentials

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.