TYPO3 Core

If your computer is too slow (or you are to fast) you can lock out yourself when editing you usersettings.
The problem is that JavaScript manipulations are done on the password field. If you hit the save button before that javascript stuff is done you'll lock out yourself as a new password is generated using you password hash as password.

Steps to reproduce:

• Open the backend as admin
• Go to the backend users module
• Edit your own user
• And then be very fast and click the save button
• Now log out and try to login - that wont work (or just compare the password hash in the database before and after)

A solution could be to disable the save button until everything is initialized.