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CVE-2026-71297— Maestro: maestro: grpc broker has no auth interceptor and client mtls is optional

Quick assessment

Affected
Red Hat Multicluster Engine for Kubernetes
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 maestro gRPC 代理中发现了一个缺陷。该漏洞允许具备有效客户端证书的远程攻击者绕过身份认证机制。利用此绕过能力，攻击者可订阅其他消费者的事件流，导致未经授权的信息泄露；或发布伪造的代理状态信息，从而破坏数据完整性。

CVSS 5.4 · Medium
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I. Basic Information for CVE-2026-71297

Vulnerability Information
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Vulnerability Title
Maestro: maestro: grpc broker has no auth interceptor and client mtls is optional
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Multicluster Engine for Kubernetes - cpe:/a:redhat:multicluster_engine
Red Hat Multicluster Engine for Kubernetes - cpe:/a:redhat:multicluster_engine

II. Public POCs for CVE-2026-71297

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III. Intelligence Information for CVE-2026-71297

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Other References for CVE-2026-71297 (2)

Same Patch Batch · Red Hat · 2026-10-05 · 13 CVEs total

CVE-2026-101919 8.8 HIGH Hypershift: hypershift: unsanitized kubeconfig passthrough from tenant namespace to contro
CVE-2026-71299 6.5 MEDIUM Maestro: maestro: rest api write endpoints registered without authentication middleware
CVE-2026-105306 6.5 MEDIUM Keycloak-services: keycloak-services: token introspection audience bypass via dynamic clie
CVE-2026-71298 6.4 MEDIUM Maestro: sql identifier injection via properties.* search filter and orderby field
CVE-2026-105302 5.7 MEDIUM Keycloak-services: keycloak-services: user session note mapper exposes upstream idp access
CVE-2026-105447 5.5 MEDIUM Quay: quay: global read-only superuser can access build trigger write credentials
CVE-2026-104030 5.5 MEDIUM Sssd: sssd: denial of service via out-of-bounds read during passkey parsing
CVE-2026-102295 5.4 MEDIUM Quay: quay: dom-based cross-site scripting via oauth local callback format=json parameter
CVE-2026-102576 4.2 MEDIUM Quay: quay: dom-based cross-site scripting via unvalidated redirect_url on signin page
CVE-2026-105301 4.0 MEDIUM Keycloak-services: keycloak-services: blind ssrf via x.509 authenticator fetching attacker
CVE-2026-104029 3.3 LOW Sssd: sssd: denial of service via out-of-bounds read in autofs responder
CVE-2026-105326 2.5 LOW Cups: cups: argument injection in mailto notifier via notify-recipient-uri

IV. Related Vulnerabilities

Same product: Multicluster Engine for Kubernetes
Same vendor: Red Hat
Same weakness: CWE-306

V. Comments for CVE-2026-71297

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