All of my fellow developers and readers,
"A few hours ago we released a Microsoft Security Advisory about a security vulnerability in ASP.NET. This vulnerability exists in all versions of ASP.NET." - Scott posted this on his blog. And this affects all the SharePoint based projects also. And its really a big vulnerability for all of the ASP.NET based applications.
Please go through the Scott's blog post and fix your solution asap. Select the following link to visit the post:
Important: ASP.NET Security Vulnerability
Other meaningful blog post: vulnerability-in-asp-net-and-sharepoint.aspx by SP Team Blog