The hacker named, z0mb13, added he managed to run a curl script enabling to create a user with instant admin rights.
This screenshot below was provided by the hacker.
Currently, the forums site(/www.webmasterbb.net) still displays the defacement by z0mb13. When first visited, a changing body background color will show with messages by the hacker. A redirection will follow that will brought visitors to a file named z0mb13.php.
WebmasterBB is claimed to be one of the faster growing webmasters forum in the internet which includes topic like: seo forums, webmaster forums, hosting forums, and webmaster tools. The website is also ranked not more than 150k in alexa traffic ranking.