Blog update: I have discovered and reported an open redirect on Guelph’s library website using the URL:
You are able to concatinate any google url onto the end of this url and will be redirected to that site. Using the google open redirect:
https://www.google.com/search?source=<site>&hl= <site> &q= <site> &btnG= <site> &btnI= <site>
you are able to double redirect to any site eg (youtube.com), not just google sites.