A weakness has been reported in WebsitePanel, which can be exploited by malicious people to conduct spoofing attacks.
Input passed via the "ReturnUrl" parameter to Default.aspx (when "pid" is set to "Login") is not properly verified before being used to redirect users. This can be exploited to redirect a user to an arbitrary website e.g. when a user clicks a specially crafted link to the affected script hosted on a trusted domain.
The weakness is reported in version 1.2.0. Other versions may also be affected.
Solution: Reportedly fixed in version 18.104.22.168 beta.
Provided and/or discovered by: Anastasios Monachos in a bug ticket.
Original Advisory: http://websitepanel.codeplex.com/workitem/224
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