Description
A flaw was found in the maestro gRPC broker. This vulnerability allows a remote attacker, with a valid client certificate, to bypass authentication. This bypass enables the attacker to subscribe to other consumers' event streams, leading to unauthorized information disclosure, or to publish forged agent status, which can compromise data integrity.
Published: 2026-10-05
Score: 5.4 Medium
EPSS: n/a
KEV: No
AI Analysis

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Remediation

Vendor Workaround

To mitigate this issue, ensure that client mTLS is enabled for the Maestro gRPC broker by configuring the `BrokerClientCAFile` parameter. If the gRPC message broker type is not required, avoid enabling it. If the gRPC broker is in use, a restart or service reload may be required after applying the configuration changes.

Tracking

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Advisories

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History

Mon, 05 Oct 2026 20:15:00 +0000

Type Values Removed Values Added
Description A flaw was found in the maestro gRPC broker. This vulnerability allows a remote attacker, with a valid client certificate, to bypass authentication. This bypass enables the attacker to subscribe to other consumers' event streams, leading to unauthorized information disclosure, or to publish forged agent status, which can compromise data integrity.
Title Maestro: maestro: grpc broker has no auth interceptor and client mtls is optional
First Time appeared Redhat
Redhat multicluster Engine
Weaknesses CWE-306
CPEs cpe:/a:redhat:multicluster_engine
Vendors & Products Redhat
Redhat multicluster Engine
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'}


Subscriptions

Redhat Multicluster Engine
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-05T19:55:49.523Z

Reserved: 2026-08-05T14:50:01.309Z

Link: CVE-2026-71297

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-05T20:17:25.103

Modified: 2026-10-05T20:17:25.103

Link: CVE-2026-71297

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-05T21:45:20Z

Weaknesses
  • CWE-306

    Missing Authentication for Critical Function