Security :: Assuming Identity Of Other Logged In Users In Web Application

Nov 1, 2010

I have a web application with a login form. A user enters a user name and password. If they exist in the database the user is authenticated using these two lines:
[Code]....

The problem is that when a user logs in at first he is logged in as himself. When navigating on the web application for a while the user assumes the identity of another logged in user. This happens all the time. In my web.config the authentication mode looks like this:
[Code]....

The site does not use ASP.NET session variables. Instead each page initializes a Singleton class, which stores itself in a static class variable, always accessing the users data already read from the database. The Singleton implementation is:
[Code]....

Could the problem with assuming another logged in users "session" be related to static classes in my application or a Forms Authentication configuration or a configuration in IIS (e.g. is it possible for users to have their own process?).

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