source: http://www.securityfocus.com/bid/7745/info

P-Synch does not adequately filter HTML code from URL parameters, making it prone to cross-site scripting attacks. Code will be executed in the security context of the system running P-Synch.

This may enable a remote attacker to steal cookie-based authentication credentials from legitimate users. Other attacks are also possible. 

https://path/to/psynch/nph-psf.exe?css=">[VBScript, JScript etc]