vBulletin 3.5.2 Released
Quote from vbulletin.com forum:
vBulletin 3.5.2
vBulletin 3.5.2 is primarily a standard bug-fix/maintenance release for the vBulletin 3.5 series. However, this release includes fixes for two potential XSS (cross site scripting) security issues. If you do not upgrade, it is very important to at least patch your board. Please see the end of this post [...]

Link To Original Article