Cross-site scripting (XSS) vulnerability in the leave comment (feedback) feature in Typo 5.1.3 and earlier allows remote attackers to inject arbitrary web script or HTML via the (1) comment[author] (Name) and (2) comment[url] (Website) parameters.
https://exchange.xforce.ibmcloud.com/vulnerabilities/46204
http://www.securityfocus.com/bid/31993
http://www.securityfocus.com/archive/1/497970