[2.0.x] Fixed #29206 -- Fixed PasswordResetConfirmView crash when the URL contains a non-UUID where one is expected.

Backport of aeb8c38178 from master

AUTHORS

@@ -544,6 +544,7 @@ answer newbie questions, and generally made Django that much better:
     Matt Riggott
     Matt Robenolt <m@robenolt.com>
     Mattia Larentis <mattia@laretis.eu>
+    Mattia Procopio <promat85@gmail.com>
     Mattias Loverot <mattias@stubin.se>
     mattycakes@gmail.com
     Max Burstein <http://maxburstein.com>

django/contrib/auth/views.py

@@ -13,6 +13,7 @@ from django.contrib.auth.forms import (
 )
 from django.contrib.auth.tokens import default_token_generator
 from django.contrib.sites.shortcuts import get_current_site
+from django.core.exceptions import ValidationError
 from django.http import HttpResponseRedirect, QueryDict
 from django.shortcuts import resolve_url
 from django.template.response import TemplateResponse
@@ -472,7 +473,7 @@ class PasswordResetConfirmView(PasswordContextMixin, FormView):
             # urlsafe_base64_decode() decodes to bytestring
             uid = urlsafe_base64_decode(uidb64).decode()
             user = UserModel._default_manager.get(pk=uid)
-        except (TypeError, ValueError, OverflowError, UserModel.DoesNotExist):
+        except (TypeError, ValueError, OverflowError, UserModel.DoesNotExist, ValidationError):
             user = None
         return user
 

docs/releases/2.0.4.txt

@@ -17,3 +17,7 @@ Bugfixes
 
 * Corrected admin's autocomplete widget to add a space after custom classes
   (:ticket:`29221`).
+
+* Fixed ``PasswordResetConfirmView`` crash when using a user model with a
+  ``UUIDField`` primary key and the reset URL contains an encoded primary key
+  value that decodes to a non-UUID (:ticket:`29206`).

tests/auth_tests/test_views.py

@@ -30,6 +30,7 @@ from django.test.utils import patch_logger
 from django.urls import NoReverseMatch, reverse, reverse_lazy
 from django.utils.deprecation import RemovedInDjango21Warning
 from django.utils.encoding import force_text
+from django.utils.http import urlsafe_base64_encode
 from django.utils.translation import LANGUAGE_SESSION_KEY
 
 from .client import PasswordResetConfirmClient
@@ -439,6 +440,14 @@ class UUIDUserPasswordResetTest(CustomUserPasswordResetTest):
         )
         return super()._test_confirm_start()
 
+    def test_confirm_invalid_uuid(self):
+        """A uidb64 that decodes to a non-UUID doesn't crash."""
+        _, path = self._test_confirm_start()
+        invalid_uidb64 = urlsafe_base64_encode('INVALID_UUID'.encode()).decode()
+        first, _uuidb64_, second = path.strip('/').split('/')
+        response = self.client.get('/' + '/'.join((first, invalid_uidb64, second)) + '/')
+        self.assertContains(response, 'The password reset link was invalid')
+
 
 class ChangePasswordTest(AuthViewsTestCase):