In Hazelcast up to and including 4.1.10, 4.2 up to and including 4.2.8, 5.0 up to and including 5.0.5, 5.1 up to and including 5.1.7, 5.2 up to and including 5.2.4, and 5.3 up to and including 5.3.2, some client operations don't check permissions properly, allowing authenticated users to access data stored in the cluster.
Vulmon