CVE-2026-71297
Received Received - Intake

maestro gRPC Broker Authentication Bypass

Publication date: 2026-10-05

Last updated on: 2026-10-05

Assigner: redhat-SADP

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.

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Meta Information

Published
2026-10-05
Last Modified
2026-10-05
Generated
2026-10-06
AI Q&A
2026-10-05
EPSS Evaluated
N/A
NVD
CVE-2026-71297
EUVD
EUVD-2026-92711

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
red_hat maestro *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

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Executive Summary

This vulnerability is in the maestro gRPC broker, allowing a remote attacker with a valid client certificate to bypass authentication. This enables them to subscribe to other consumers' event streams or publish forged agent status, leading to unauthorized information disclosure or data integrity compromise.

Detection Guidance

Check if the gRPC broker is enabled by verifying if the --message-broker-type=grpc flag is set in maestro component configurations. Inspect network traffic for unauthorized event stream subscriptions or forged agent status publications using packet capture tools like tcpdump or Wireshark.

Impact Analysis

An attacker could intercept sensitive event streams between agents, gaining unauthorized access to confidential data. They could also forge agent status reports, potentially misleading systems or triggering incorrect actions based on false information.

Compliance Impact

This vulnerability could lead to unauthorized data access or tampering, violating confidentiality and integrity requirements in GDPR and HIPAA. Non-compliance risks include legal penalties, reputational damage, and loss of trust due to potential data breaches.

Mitigation Strategies

Enable client mTLS for the Maestro gRPC broker by configuring the BrokerClientCAFile parameter. If the gRPC message broker type is not required, avoid enabling it. Restart or reload the service after applying changes to ensure the configuration takes effect.

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