# Django 5.2.17 documentation

# Django 1.8.7 release notes

November 24, 2015

Django 1.8.7 fixes a security issue and several bugs in 1.8.6.

Additionally, Django’s vendored version of six, `django.utils.six`, has been upgraded to the latest release (1.10.0).

## Fixed settings leak possibility in `date` template filter

If an application allows users to specify an unvalidated format for dates and passes this format to the `date` filter, e.g. `{{ last_updated|date:user_date_format }}`, then a malicious user could obtain any secret in the application’s settings by specifying a settings key instead of a date format. e.g. `"SECRET_KEY"` instead of `"j/m/Y"`.

To remedy this, the underlying function used by the `date` template filter, `django.utils.formats.get_format()`, now only allows accessing the date/time formatting settings.

## Bugfixes

- Fixed a crash of the debug view during the autumn DST change when `USE_TZ` is `False` and `pytz` is installed.

- Fixed a regression in 1.8.6 that caused database routers without an `allow_migrate()` method to crash (#25686).

- Fixed a regression in 1.8.6 by restoring the ability to use `Manager` objects for the `queryset` argument of `ModelChoiceField` (#25683).

- Fixed a regression in 1.8.6 that caused an application with South migrations in the `migrations` directory to fail (#25618).

- Fixed a data loss possibility with `Prefetch` if `to_attr` is set to a `ManyToManyField` (#25693).

- Fixed a regression in 1.8 by making `gettext()` once again return UTF-8 bytestrings on Python 2 if the input is a bytestring (#25720).

- Fixed serialization of `DateRangeField` and `DateTimeRangeField` (#24937).

- Fixed the exact lookup of `ArrayField` (#25666).

- Fixed `Model.refresh_from_db()` updating of `ForeignKey` fields with `on_delete=models.SET_NULL` (#25715).

- Fixed a duplicate query regression in 1.8 on proxied model deletion (#25685).

- Fixed `set_FOO_order()` crash when the `ForeignKey` of a model with `order_with_respect_to` references a model with a `OneToOneField` primary key (#25786).

- Fixed incorrect validation for `PositiveIntegerField` and `PositiveSmallIntegerField` on MySQL resulting in values greater than 4294967295 or 65535, respectively, passing validation and being silently truncated by the database (#25767).