Michele at Blacknight highlighted an important, ongoing issue for those using content management systems - Joomla included. She was writing about how earlier this year (July) a number of attacks were noted on Joomla run web sites. And I know from when I was using a different CMS to host an article directory, that I experienced problems at the begriming of the year, that resulted in a temporary disabling of my site. Fortunately, that attack was a fairly simple one to fix, but it caused me some frustration and headaches whilst I was figuring it out.
Because popular CMS are, well, popular, they become targets for less than ethical people trying to promote their own dubious sites (you can imagine the type). So, it’s up to the webmasters who use a CMS to keep on top of security.