CVE-2015-8603
Cross-site scripting (XSS) vulnerability in Serendipity before 2.0.3 allows remote attackers to inject arbitrary web script or HTML via the serendipity[entry_id] parameter in an "edit" admin action to serendipity_admin.php.
Date published : 2016-01-12
http://www.securityfocus.com/archive/1/537248/100/0/threaded
http://blog.s9y.org/archives/266-Serendipity-2.0.3-released.html