#28645: AuthenticationForm's inactive user error isn't raised when using
ModelBackend
-------------------------------------+-------------------------------------
     Reporter:  Guilherme Junqueira  |                    Owner:
                                     |  shangdahao
         Type:  Bug                  |                   Status:  new
    Component:  contrib.auth         |                  Version:  1.11
     Severity:  Normal               |               Resolution:
     Keywords:  2.1                  |             Triage Stage:  Accepted
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------

Comment (by Tim Graham):

 That approach may leak whether or not a username exists because of the
 time it takes to hash a password. For user names that exist, password
 hashing will run twice compared to once for user names that don't exist.
 See #20760 for a past example.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/28645#comment:15>
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