XSS vulnerability in CMSQLite

Vulnerability ID: HTB22464
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_cmsqlite.html
Product: CMSQLite
Vendor: CMSQLite-Team
Vulnerable Version: 1.3 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 "/admin/editMenu.php" script to properly sanitize user-supplied input in "langId" 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:
http://host/admin/editMenu.php?id=1&langId=en'"><script>alert(document.cookie)</script>