The editor in IPython Notebook before 3.2.2 and Jupyter Notebook 4.0.x before 4.0.5 allows remote attackers to execute arbitrary JavaScript code via a crafted file, which triggers a redirect to files/, related to MIME types.
https://security.gentoo.org/glsa/201512-02
https://github.com/jupyter/notebook/commit/9e63dd89b603dfbe3a7e774d8a962ee0fa30c0b5
https://github.com/ipython/ipython/commit/0a8096adf165e2465550bd5893d7e352544e5967
https://bugzilla.redhat.com/show_bug.cgi?id=1264067
http://seclists.org/oss-sec/2015/q3/634
http://seclists.org/oss-sec/2015/q3/558
http://lists.fedoraproject.org/pipermail/package-announce/2015-September/167670.html