CVE-2026-71297 Maestro: maestro: grpc broker has no auth interceptor and client mtls is optional
Remote attackers with valid certificates can bypass gRPC authentication to access event streams or forge agent status in Red Hat Multicluster Engine.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-71297?
CVE-2026-71297 is a medium-severity missing authorization vulnerability in Red Hat Multicluster Engine for Kubernetes, published on 5 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-306
Which versions are affected by CVE-2026-71297?
How do I fix CVE-2026-71297?
No fix has been published for CVE-2026-71297 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-71297 being exploited?
There is no known exploitation of CVE-2026-71297 in the wild and no public exploit code.
Sources
Also known as GHSA-99qh-3h9r-vq6x.