There is a serious Joomla security hole that affects you if you run versions 2.5.x or 3.1.x. Read about it here. Your best bet would be to upgrade to the most current version (the version in our web app gallery has been updated), but if you can't upgrade there is an easy fix for the bug. Our blog article tells you exactly what you need to do. Don't put this off, it's an unpleasant exploit (aren't they all) and you don't want to fall prey to it.
