diff --git a/django/contrib/auth/forms.py b/django/contrib/auth/forms.py
index d17c41132e..dfd039f018 100644
--- a/django/contrib/auth/forms.py
+++ b/django/contrib/auth/forms.py
@@ -89,9 +89,9 @@ class UserCreationForm(forms.ModelForm):
         raise forms.ValidationError(self.error_messages['duplicate_username'])
 
     def clean_password2(self):
-        password1 = self.cleaned_data.get("password1", "")
-        password2 = self.cleaned_data["password2"]
-        if password1 != password2:
+        password1 = self.cleaned_data.get("password1")
+        password2 = self.cleaned_data.get("password2")
+        if password1 and password2 and password1 != password2:
             raise forms.ValidationError(
                 self.error_messages['password_mismatch'])
         return password2
diff --git a/django/contrib/auth/tests/forms.py b/django/contrib/auth/tests/forms.py
index 2ab895804f..13b8dd1216 100644
--- a/django/contrib/auth/tests/forms.py
+++ b/django/contrib/auth/tests/forms.py
@@ -65,6 +65,7 @@ class UserCreationFormTest(TestCase):
         form = UserCreationForm(data)
         self.assertFalse(form.is_valid())
         self.assertEqual(form['password1'].errors, required_error)
+        self.assertEqual(form['password2'].errors, [])
 
     def test_success(self):
         # The success case.