Open redirect vulnerability in api.php in SiteEngine 5.x allows user-assisted remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a URL in the forward parameter in a logout action.
https://www.exploit-db.com/exploits/6823
http://www.securityfocus.com/bid/31888
http://www.securityfocus.com/archive/1/497747/100/0/threaded