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Fencer Vulns
high 8.5

CVE-2026-71576 json

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

published 2026-08-10 2 mo ago modified 2026-10-24 16 d ago also EUVD-2026-55674

cvss
8.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

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.

Patch / fix

  • 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

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-2026-71576 updated cvss 8.5

multicluster-global-hub: multicluster-global-hub: Manager trusts self-asserted evt.Source() for leaf-hub identity in all status handlers

  • Red Hat Multicluster Global Hub 1.4.9 multicluster-globalhub/multicluster-globalhub-manager-rhel9 1788355599
    fixed: vendor fix RHSA-2026:67516
  • Red Hat Multicluster Global Hub 1.5.8 multicluster-globalhub/multicluster-globalhub-manager-rhel9 1789515288
    fixed: vendor fix RHSA-2026:71597
  • Red Hat Multicluster Global Hub 1.6.6 multicluster-globalhub/multicluster-globalhub-manager-rhel9 1790086176
    fixed: vendor fix RHSA-2026:73419
  • Red Hat Multicluster Global Hub 1.7.3 multicluster-globalhub/multicluster-globalhub-manager-rhel9 1788377424
    fixed: vendor fix RHSA-2026:67842
  • Red Hat Multicluster Global Hub 1.8.2 multicluster-globalhub/multicluster-globalhub-manager-rhel9 1788359454
    fixed: vendor fix RHSA-2026:68515
  • 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-rhel9-operator 1788355417, 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-rhel9-operator 1789478830, 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-rhel9-operator 1790085268, 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-rhel9-operator 1788372439, 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-rhel9-operator 1788359461, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1790638386, +4 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

0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L

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-345 Insufficient Verification of Data Authenticity

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.