Cross site scripting vulnerability in 53KF < 2.0.0.2 that allows for arbitrary code to be executed via crafted HTML statement inserted into chat window.
The server for 53KF Web IM 2009 Home, Professional, and Enterprise editions relies on client-side protection mechanisms against cross-site scripting (XSS), which allows remote attackers to conduct XSS attacks by using a modified client to send a crafted IM message, related to the msg variable.