Vulnerability · Published Oct 5, 2026 · Assigned by redhat

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

Medium 5.4

In plain English

A medium-severity missing authentication in Multicluster Engine for Kubernetes from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 95.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Red Hat	Multicluster Engine for Kubernetes	see references
Red Hat	Multicluster Engine for Kubernetes	see references

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

https://access.redhat.com/security/cve/CVE-2026-71297 vdb-entry, x_refsource_REDHAT
RHBZ#2511518 issue-tracking, x_refsource_REDHAT