---
id: CVE-2026-71576
title: A flaw was found in multicluster-global-hub
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
  clien…
severity: high
cvss: 8.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L'
cwe:
  - CWE-345
vendor: Red Hat
product: multicluster-globalhub/multicluster-globalhub-manager-rhel9
affected:
  - multicluster-globalhub/multicluster-globalhub-manager-rhel9 (all versions)
  - multicluster-globalhub/multicluster-globalhub-manager-rhel9 (all versions)
  - multicluster-globalhub/multicluster-globalhub-manager-rhel9 (all versions)
patched:
  - multicluster_global_hub 1.4.9
  - multicluster_global_hub 1.7.3
  - multicluster_global_hub 1.8.2
published: '2026-08-10'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T17:17:05.937'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71576'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:67516'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:67842'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:68515'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:71597'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-71576'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2512513'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71576.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-71576'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71576'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00216
epssPercentile: 0.1068
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-12T15:44:50.677334Z'
ingestedAt: '2026-09-21T10:35:15.462Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:67516** · Red Hat · fixed in: Multicluster Global Hub 1.4.9 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67516)
- **RHSA-2026:67842** · Red Hat · fixed in: Multicluster Global Hub 1.7.3 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:67842)
- **RHSA-2026:68515** · Red Hat · fixed in: Multicluster Global Hub 1.8.2 · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68515)
- **RHSA-2026:71597** · Red Hat · fixed in: Multicluster Global Hub 1.5.8 · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71597)