django/docs/releases/2.2.16.txt

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===========================
Django 2.2.16 release notes
===========================
*September 1, 2020*
Django 2.2.16 fixes two security issues and two data loss bugs in 2.2.15.
CVE-2020-24583: Incorrect permissions on intermediate-level directories on Python 3.7+
======================================================================================
On Python 3.7+, :setting:`FILE_UPLOAD_DIRECTORY_PERMISSIONS` mode was not
applied to intermediate-level directories created in the process of uploading
files and to intermediate-level collected static directories when using the
:djadmin:`collectstatic` management command.
You should review and manually fix permissions on existing intermediate-level
directories.
CVE-2020-24584: Permission escalation in intermediate-level directories of the file system cache on Python 3.7+
===============================================================================================================
On Python 3.7+, the intermediate-level directories of the file system cache had
the system's standard umask rather than ``0o077`` (no group or others
permissions).
Bugfixes
========
* Fixed a data loss possibility in the
:meth:`~django.db.models.query.QuerySet.select_for_update()`. When using
related fields pointing to a proxy model in the ``of`` argument, the
corresponding model was not locked (:ticket:`31866`).
* Fixed a data loss possibility, following a regression in Django 2.0, when
copying model instances with a cached fields value (:ticket:`31863`).