Medium severity · published Oct 5, 2026
CVE-2026-71297
Maestro: maestro: grpc broker has no auth interceptor and client mtls is optional
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
Multicluster Engine for Kubernetes · Red Hat
All versions, or not specified · source: vendor
Affected product
ME
Multicluster Engine for Kubernetes
Red Hat
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