There is an XSS in the Wordpress default theme. Tested on WordPress version 2.2 Filename functions.php, line 387. Code: <form style="display: inline" method="post" name="hicolor" id="hicolor" action="<?php echo $_SERVER['REQUEST_URI']; ?>"> $_SERVER['REQUEST_URI'] is directly echoed to the user. This problem can be exploited if the adminstrator is logged in. Sample exploit URL. http://www.example.com/wp-admin/themes.php?page=functions.php&zmx"><scri pt>alert(1)</script> There are other XSS vulnerabilities in popular Wordpress themes. More details on http://www.xssnews.com/