While we do not condone hacking websites, there are many tutorials that can help you out, your best bet is to research into Web Application Security, attacks such as SQL Injection, Cross Site Scripting, Cross Site Request Forgery are good areas to start. Its best to learn these attacks manually, but if you are too lazy, tools such as sqlmap, nikto, nessus may help you.
Its hard to sum up "how to hack a website" but with without any information provided and without knowing your skills its hard to make a good reply. Hope it helps
u have to pentest the website..and find the what are the plugins that site is using..then find out the exploits for that plugins..and find out the vbulletin exploits too...find out the vbulletin version and search for the exploits..and try login,search box for find some vuns..but i don't think soo for that... :D
trying to find some vun..happy hacking..:D
var name = "CheaTax"; document.write(name + " , a Programmer a Hacker!!!");
So you want to hack a forum? You are going to have a hard time finding exploits and exploiting the forum. Since vBulletin costs money you are always checking for new updates to install since it's all something you have payed for. Your best shot would be if the admin haven't patched the software for quite a while. Otherwise you will have to SE the admin.