So.. apparently this SQL injectable website does not allow user or users keyword.

But.. id=user and id=users are allowed. I have no time to determine what WAF rules are applied. All I know is that I don't really know when they will drop a request. I just try something and see if it works.

And then suddenly after randomly mashing my keys to find a working payload, this worked:

'+/*!40000union*/select+/*randomlongstringhehehehehe*/user,password+from/*anotherlongstringhehehehehe*/users%23

meme