Cross-site scripting (XSS) vulnerability in Serendipity (S9Y) before 1.3 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors related to received trackbacks.
https://exchange.xforce.ibmcloud.com/vulnerabilities/41343
http://www.vupen.com/english/advisories/2008/0925/references
http://www.securityfocus.com/bid/28298
http://www.debian.org/security/2008/dsa-1528
http://secunia.com/advisories/29502
http://secunia.com/advisories/29398
http://blog.s9y.org/archives/192-Serendipity-1.3-released-addresses-security.html