Django -- information leakage

Django release notes:

CVE-2018-6188: Information leakage in AuthenticationForm
A regression in Django 1.11.8 made AuthenticationForm run its
confirm_login_allowed() method even if an incorrect password is entered.
This can leak information about a user, depending on what messages
confirm_login_allowed() raises. If confirm_login_allowed() isn’t
overridden, an attacker enter an arbitrary username and see if that user
has been set to is_active=False. If confirm_login_allowed() is
overridden, more sensitive details could be leaked.
This issue is fixed with the caveat that AuthenticationForm can no
longer raise the “This account is inactive.” error if the authentication
backend rejects inactive users (the default authentication backend,
ModelBackend, has done that since Django 1.10). This issue will be
revisited for Django 2.1 as a fix to address the caveat will likely be too
invasive for inclusion in older versions.