I think you are over worrying. If all you do is to forward a port on your router to your PC you are just enabling access to that one port. All that will be listening on that port is Calibre; the only service that will be accessible to the outside will be via that one port and all that will be accessible on that port is Calibre content server, no other resources on your PC will be accessible.
On top of that CCS will require a user ID and password.
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