I am not sure what forum that one is?
The Burgmanriders.com site was hacked - is that a 'nick' name it has maybe?
A site I am a SuperMod on (clubnook.com - ebook site) was hacked also by the S.E.A.
Syrian Electronic Army - the ones that recently hacked the Marine Corps Web Site and a number of News Outlets also.
There seems to be a weakness in V-Bulletin the software that a lot of forum sites use.