Manic Web MWGuest 2.1 - 'MWguest.php' HTML Injection

source: https://www.securityfocus.com/bid/17630/info

MWGuest is prone to an HTML-injection vulnerability because the application fails to properly sanitize user-supplied input before using it in dynamically generated content. 

Attacker-supplied HTML and script code would be executed in the context of the affected website, potentially allowing an attacker to steal cookie-based authentication credentials or to control how the site is rendered to the user. Other attacks are also possible. 

Version 2.1.0 is vulnerable. Prior versions may be vulnerable as well.

URL: http://www.example.com/mwguest/mwguest.php
Homepage: ">[XSS]<aaa aaa="