I noticed a security issue in cPanel.
If you login to cPanel via
www.yourdomain.com/cpanel, then click "Log Out". The next page says "Click here to login again". I click that link and then I am prompted with the login box. I press cancel 3 times on the login prompt. Then I can still browse and use cPanel as if I never logged off. I don't think you are terminating the session.
You can also press "Back" on your browser and click cancel on the login prompt. Again you can use cPanel as if you hadn't logged out. Also, I do not save passwords or logins, my login prompt is empty when I am asked to re-enter login info. I assume the response will be close the browser. But, this is not the best solution.
Just an FYI.
-Darren