September 1, 2020
Django 2.2.16 fixes two security issues and two data loss bugs in 2.2.15.
On Python 3.7+,
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
collectstatic management command.
You should review and manually fix permissions on existing intermediate-level directories.
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
Fixed a data loss possibility in the
select_for_update(). When using
related fields pointing to a proxy model in the
of argument, the
corresponding model was not locked (#31866).
Fixed a data loss possibility, following a regression in Django 2.0, when copying model instances with a cached fields value (#31863).