CVE-2015-5963: High severity django vulnerability

contrib.sessions.middleware.SessionMiddleware in Django 1.8.x before 1.8.4, 1.7.x before 1.7.10, 1.4.x before 1.4.22, and possibly other versions allows remote attackers to cause a denial of service (session store consumption or session record removal) via a large number of requests to contrib.auth.views.logout, which triggers the creation of an empty session record.

— MITRE

Following issue was reported in Django:

Previously, a session could be created when anonymously accessing the django.contrib.auth.views.logout view (provided it wasn't decorated with django.contrib.auth.decorators.loginrequired as done in the admin). This could allow an attacker to easily create many new session records by sending repeated requests, potentially filling up the session store or causing other users' session records to be evicted.

— Red Hat