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XSS vulnerability in WebPress

Vulnerability ID: HTB22479
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_webpress_1.html
Product: WebPress
Vendor: YWP ( http://www.goywp.com/ ) 
Vulnerable Version: Current at 01.07.2010 and Probably Prior Versions
Vendor Notification: 01 July 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_page_listings_entries_amd_form.php" script to properly sanitize user-supplied input in "range_listing_id" 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: