How to Create Pages Like This?

Today, I was browsing the web and searching for some parasite sites. And found the site below:


I know this is wiki page, but there is no option to create such pages, I tried searching online for any kind of vulnerability but couldn't find any. So anyone have any information regarding the method or process?

I suspect it's a login that has either been sold or someone has managed to bruteforce matching credentials from a leak. If you look at this page: https://wiki.c2b2.columbia.edu/workbench/index.php/Special:ActiveUsers
You'll see there's only one account that has been posting everything on that wiki since 2010.

Is this wiki platforms that use a markup language ?