The utils.http.is_safe_url function in Django before 1.8.10 and 1.9.x before 1.9.3 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks or possibly conduct cross-site scripting (XSS) attacks via a URL containing basic authentication, as demonstrated by http://mysite.example.com\@attacker.com.
https://www.djangoproject.com/weblog/2016/mar/01/security-releases/
https://github.com/django/django/commit/c5544d289233f501917e25970c03ed444abbd4f0
http://www.ubuntu.com/usn/USN-2915-3
http://www.ubuntu.com/usn/USN-2915-2
http://www.ubuntu.com/usn/USN-2915-1
http://www.securitytracker.com/id/1035152
http://www.securityfocus.com/bid/83879
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.debian.org/security/2016/dsa-3544
http://rhn.redhat.com/errata/RHSA-2016-0506.html
http://rhn.redhat.com/errata/RHSA-2016-0505.html