Whenever someone try to login into your WordPress dashboard with a invalid password, WordPress generates following error.
ERROR: The password you entered for the username admin is incorrect. Lost your password?
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Most of us don’t care about this error, but it can be very useful to a potential hacker in order to search for correct username and password.
You can easily change these errors by simply adding following code snippet to your functions.php file located inside your theme directory,
//Change login errors add_filter('login_errors', create_function('$a', "return '<b>Error:</b> Invalid Username or Password';"));