The caching framework in Django before 1.4.11, 1.5.x before 1.5.6, 1.6.x before 1.6.3, and 1.7.x before 1.7 beta 2 reuses a cached CSRF token for all anonymous users, which allows remote attackers to bypass CSRF protections by reading the CSRF cookie for anonymous users.
https://www.djangoproject.com/weblog/2014/apr/21/security/
http://www.ubuntu.com/usn/USN-2169-1
http://www.debian.org/security/2014/dsa-2934
http://secunia.com/advisories/61281
http://rhn.redhat.com/errata/RHSA-2014-0457.html
http://rhn.redhat.com/errata/RHSA-2014-0456.html
http://lists.opensuse.org/opensuse-updates/2014-09/msg00023.html