Cross-site scripting (XSS) vulnerability in activeCollab 2.1 Corporate allows remote attackers to inject arbitrary web script or HTML via the re_route parameter to the login script.
http://www.securityfocus.com/bid/35022
http://secunia.com/advisories/35079
http://pridels-team.blogspot.com/2009/05/activecollab-xss-and-full-path.html