File permissions

We would like to take this opportunity to stress the importance of having correct file permissions set throughout your website, whether you are using a content management system such as WordPress, Joomla or simply handcoded html. Because your site is hosted in a shared server environment, having permissions set too liberally can open your site to being written to by any user.

A detailed discussion of how to set file permissions in WordPress can be found at the following link, and much of the advice could be applied to many other content management systems as well:

http://codex.wordpress.org/Hardening_WordPress#File_permissions

A lot more specific information as well as external reference links on the subject can be found in Wikipedia:
http://en.wikipedia.org/wiki/File_system_permissions