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Sessions are significantly safer than, say, cookies. But it is still possible to steal a session and thus the hacker will have total access to whatever is in that session. Some ways to avoid this are IP Checking (which works pretty well, but is very low fi and thus not reliable on its own), and using a nonce. Typically with a nonce, you have a per-page "token" so that each page checks that the last page's nonce matches what it has stored.
In either security check, there is a loss of usability. If you do IP checking and the user is behind a intranet firewall (or any other situation that causes this) which doesn't hold a steady IP for that user, they will have to re-authenticate every time they lose their IP. With a nonce, you get the always fun "Clicking back will cause this page to break" situation.
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