Google says I have a problem with User-Generated and Third Party spam in pages with the following URL pattern:

(My Forum)/ubbthreads.php?ubb=changeprefs&what=style&value=0&curl=

Any ideas how to find the problem and fix it?

ECN Electrical Forum: https://www.electrical-contractor.net/forums/ubbthreads.php
My Day Job: https://www.licensedelectrician.com/