Multiple cross-site scripting (XSS) vulnerabilities in the ZMI page in Zope2 in Plone CMS 5.x through 5.0.6, 4.x through 4.3.11, and 3.3.x through 3.3.6 allow remote attackers to inject arbitrary web script or HTML via unspecified vectors.
https://plone.org/security/hotfix/20160830/non-persistent-xss-in-zope2
http://www.securityfocus.com/bid/92752
http://www.securityfocus.com/archive/1/539572/100/0/threaded
http://www.openwall.com/lists/oss-security/2016/09/05/5