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Answer: Login and CGI security problem.

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Q&A > CGI programming > Login and CGI security ("open cookie jar") problem. contributed by chromatic

Another option is to use a timestamp on the server. For every action the user attempts to take, check the last timestamp for that account. If it's been more than 10 minutes, require re-authorization. Otherwise, update the timestamp to the current time and perform the action.

Sure, there is a window of time where some tricky malicious scripting could redirect the client to do something unintended, but it's minimized somewhat here.

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