Whether you use WordPress, Joomla, Drupal, Google Sites, hard coded HTML or others especially if your site is driven by a database you may be wide open for malicious access.
WordPress users are almost all vulnerable as are Joomla and Drupal users but WordPress is more prolific so the "bad guys" have more targets. Find out how to tell if you are in danger, have been comprimised and how to prevent it or clean it up.
Host - Ken Cook @TheKenCook - Blog - Website
Co-Host - Mike Mueller @MikeMueller - Blog
Co-Host - Jeremy Blanton @JB140 - Blog
Co-Host - Lisa Oden @LAOden - Blog