Hazelcast Management Center through 6.0 allows remote code execution via a JndiLoginModule user.provider.url in a hazelcast-client XML document (aka a client configuration file), which can be uploaded at the /cluster-connections URI.
https://gist.github.com/azraelxuemo/c3d42739aa3306a41111ef603dc65b4c
https://docs.hazelcast.com/management-center/6.0-snapshot/getting-started/install