Please upgrade your FileMaker Server
There was a security problem in FileMaker Server, which would allow anyone to query data from a server without authentication and without any logging.
Please make sure you use version 19.6.4, 20.3.2 or newer.
Learn more about this security problem: FMS, bypass authorisation
Or watch this video on YouTube: FileMaker Server HACKED
I thought I should let you know. Thanks to Alex Dubov for reporting this issue to Claris.