CVE-2026-71577
Multicluster-global-hub: multicluster-global-hub: spec-topic read acl leaks bootstrap kubeconfigs to all managed hubs during migration
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.
INFO
Published Date :
Aug. 10, 2026, 5:17 p.m.
Last Modified :
Oct. 24, 2026, 3:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Apply access controls to the shared communication topic.
- Validate and limit read access permissions.
- Review and shorten token validity periods.
- Update the multicluster-global-hub software.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-71577.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-71577 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-71577
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-71577 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-71577 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Changed Translation Title: Multicluster Global Hub de Red Hat, Description: Se encontró una vulnerabilidad en multicluster-global-hub. Durante una ManagedClusterMigration, el sistema concede incorrectamente a todos los hubs gestionados acceso de lectura a un tema de comunicación compartido. Esto permite a un hub gestionado comprometido interceptar y recopilar kubeconfigs de arranque sensibles, que contienen tokens del servidor API destinados a otros hubs. Estos tokens tienen una validez extendida de aproximadamente 9.86 años, lo que aumenta significativamente el riesgo de acceso no autorizado y revelación de información a otros clusters gestionados. Title: Multicluster Global Hub de Red Hat, Description: Se encontró una vulnerabilidad en multicluster-global-hub. Durante una ManagedClusterMigration, el sistema concede incorrectamente a todos los hubs gestionados acceso de lectura a un tema de comunicación compartido. Esto permite a un hub gestionado comprometido interceptar y recopilar kubeconfigs de arranque sensibles, que contienen tokens del servidor API destinados a otros hubs. Estos tokens tienen una validez extendida de aproximadamente 9.86 años, lo que aumenta significativamente el riesgo de acceso no autorizado y revelación de información a otros clusters gestionados. -
CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: Multicluster Global Hub de Red Hat, Description: Se encontró una vulnerabilidad en multicluster-global-hub. Durante una ManagedClusterMigration, el sistema concede incorrectamente a todos los hubs gestionados acceso de lectura a un tema de comunicación compartido. Esto permite a un hub gestionado comprometido interceptar y recopilar kubeconfigs de arranque sensibles, que contienen tokens del servidor API destinados a otros hubs. Estos tokens tienen una validez extendida de aproximadamente 9.86 años, lo que aumenta significativamente el riesgo de acceso no autorizado y revelación de información a otros clusters gestionados. -
CVE Modified by [email protected]
Sep. 29, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/71xxx/CVE-2026-71577.json">CVE-2026-71577</a> Added Reference https://access.redhat.com/errata/RHSA-2026:73038 Added Reference https://access.redhat.com/errata/RHSA-2026:73419 -
CVE Modified by [email protected]
Sep. 24, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/71xxx/CVE-2026-71577.json">CVE-2026-71577</a> Added Reference https://access.redhat.com/errata/RHSA-2026:71597 -
CVE Modified by [email protected]
Sep. 21, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/71xxx/CVE-2026-71577.json">CVE-2026-71577</a> Added Reference https://access.redhat.com/errata/RHSA-2026:67516 Added Reference https://access.redhat.com/errata/RHSA-2026:67842 Added Reference https://access.redhat.com/errata/RHSA-2026:68515 Added Reference https://access.redhat.com/security/cve/CVE-2026-71577 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2512514 Removed Reference https://access.redhat.com/security/cve/CVE-2026-71577 Removed Reference https://bugzilla.redhat.com/show_bug.cgi?id=2512514 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 11, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-71577', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-11T01:59:24.928197Z'} -
New CVE Received by [email protected]
Aug. 10, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:multicluster_globalhub'], 'vendor': 'Red Hat', 'product': 'Multicluster Global Hub', 'packageName': 'multicluster-globalhub/multicluster-globalhub-rhel9-operator', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}] Added 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. Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N Added CWE CWE-522 Added Reference https://access.redhat.com/security/cve/CVE-2026-71577 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2512514