Recently it was found that there was an exploit which could execute the commands by just knowing the name of Plugin Messaging Channel that this plugin uses.
To counter this, instead of having a general name for the messaging channel, server owners can now set a custom channel name, uniquely for their server. This can be done from the config.yml files of both the BungeeCord part of the plugin and the Spigot part.
Please note that if you modify the channel name, it must be modified for all the config.yml files (bungeecord part and the spigot part).