Cross-site scripting (XSS) vulnerability in the URL checking infrastructure in Plone CMS 5.x through 5.0.6, 4.x through 4.3.11, and 3.3.x through 3.3.6 allows remote attackers to inject arbitrary web script or HTML via a crafted URL.
https://plone.org/security/hotfix/20160830/non-persistent-xss-in-plone-1
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