Amy Green

Login errors in WordPress can be used by hackers to guess whether they entered wrong username or password.
This is a lightweight plugin that will hide those login errors and make your WordPress login more secure.
Features: 
* No annoying settings to deal with. 
* Install and automatically hide login errors. 
* Lightweight with only a few lines of code.

Hide Login Errors

Login errors in WordPress can be used by hackers to guess whether they entered wrong username or password.

cubecolour

WordPress 4.5 added the ability to login using the registered user’s email address in place of the username. When this plugin is active, the ability to login using the email address in place of the username is removed, and the label of the input field is changed to reflect this.

No Login by Email Address

Removes the ability to login using the email address instead of the username.

Hide Login Errors vs No Login by Email Address