http://www.stevenroddis.com.au/2006/10/06/torrentflux-user-agent-xss-vulnerability/ 
Name: TorrentFlux User-Agent XSS Vulnerability
Published: 2006-10-06
Critical Level: Moderate
Type: Cross-Site Scripting
Where: Remote
Status: 0-Day
Software: Torrentflux 2.1
Discoverer: Steven Roddis (http://www.stevenroddis.com.au) 
I gave the authors of this product a week (more than usual) just to contact me, they have failed to do so; so I am releasing this vulnerability publicly!
/admin.php
Line: 325
$ip_info = $ip_resolved."
".$user_agent;
Useragent is not esacped.
Solution:
Edit source code:
/admin.php
Line: 325:
$ip_info = htmlentities($ip_resolved)."
".htmlentities($user_agent);