Added 1.4.6/1.5.2 release notes.

docs/releases/1.4.6.txt

@@ -0,0 +1,31 @@
+==========================
+Django 1.4.6 release notes
+==========================
+
+*August 13, 2013*
+
+Django 1.4.6 fixes one security issue present in previous Django releases in
+the 1.4 series, as well as one other bug.
+
+This is the sixth bugfix/security release in the Django 1.4 series.
+
+Mitigated possible XSS attack via user-supplied redirect URLs
+-------------------------------------------------------------
+
+Django relies on user input in some cases (e.g.
+:func:`django.contrib.auth.views.login`, :mod:`django.contrib.comments`, and
+:doc:`i18n </topics/i18n/index>`) to redirect the user to an "on success" URL.
+The security checks for these redirects (namely
+``django.util.http.is_safe_url()``) didn't check if the scheme is ``http(s)``
+and as such allowed ``javascript:...`` URLs to be entered. If a developer
+relied on ``is_safe_url()`` to provide safe redirect targets and put such a
+URL into a link, he could suffer from a XSS attack. This bug doesn't affect
+Django currently, since we only put this URL into the ``Location`` response
+header and browsers seem to ignore JavaScript there.
+
+Bugfixes
+========
+
+* Fixed an obscure bug with the :func:`~django.test.utils.override_settings`
+  decorator. If you hit an ``AttributeError: 'Settings' object has no attribute
+  '_original_allowed_hosts'`` exception, it's probably fixed (#20636).