CVE-2026-71297

Maestro: maestro: grpc broker has no auth interceptor and client mtls is optional

Published Oct 5, 2026 CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
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.

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

No advisories available
History
Type Values Removed Values Added
First Time appeared Maestro
Maestro maestro
Vendors & Products Maestro
Maestro maestro
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Oct 6, 2026, 2:49 PM
Reserved
Aug 5, 2026, 2:50 PM
Status
Awaiting Analysis
Published
Oct 5, 2026, 8:17 PM
Modified
Oct 6, 2026, 3:17 PM
Severity
Moderate
Public date
Oct 5, 2026, 6:00 PM