Vulnerability ID: HTB22428 Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_forumcms.html Product: ForumCMS Vendor: Forum Web Design Vulnerable Version: Current at 08.06.2010 and Probably Prior Versions Vendor Notification: 10 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 "search/results" script to properly sanitize user-supplied input in "keyword" 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/cms/ForumCMS/page/search/results method=POST name=main> <input type=hidden name=keyword value="<script>alert(document.cookie)</script>" > </form> <script> document.main.submit(); </script>