Cross-site scripting (XSS) vulnerability in the Top Referrers (aka referrer) plugin in Serendipity (S9Y) before 1.3.1 allows remote attackers to inject arbitrary web script or HTML via the Referer HTTP header.
https://exchange.xforce.ibmcloud.com/vulnerabilities/41965
http://www.vupen.com/english/advisories/2008/1348/references
http://www.securitytracker.com/id?1019915
http://www.securityfocus.com/archive/1/491176/100/0/threaded
http://secunia.com/advisories/29942
http://int21.de/cve/CVE-2008-1385-s9y.html
http://blog.s9y.org/archives/193-Serendipity-1.3.1-released.html
http://archives.neohapsis.com/archives/fulldisclosure/2008-04/0590.html