Stop wordpress from validating ANY url

Can someone PLEASE tell me how to get my wordpress to stop serving up a page under any and all urls, e.g.:

https://www.mysite.com/somecategory/blue-widgets/

… is a valid url.

Unfortunately these all come back as the same valid URL.

https://www.mysite.com/blahblah/blue-widgets/
https://www.mysite.com/x82342kjasdfasd/blue-widgets/
https://www.mysite.com/82348q384q823/doodoodoo/blue-widgets/

Very very bad. I have looked at other peoples’ 2.6.1 installations and they seem to do the same thing.

Can someone PLEASE HELP.