Date: 05/11/05 (Java Web)    Keywords: php

WordPress has unique plugin architecture. Plugins are simply php files which are included (and executed) before any php pages which renders the content, whether it is your blog page or syndication feed or even administrative functions. The plugins can do anything that is allowed by php code, including trashing your hard-disk to sending your bank [...]

Source: http://blog.taragana.com/index.php/archive/at-the-mercy-of-wordpress-plugins-and-how-to-fight-back/