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.

More... (http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2008-4903)