Cross-site request forgery (CSRF) vulnerability in Serendipity 0.8.4 and earlier allows remote attackers to perform unauthorized actions as a logged in user via a link or IMG tag to serendipity_admin.php.
Cross-site scripting (XSS) vulnerability in the BBCode plugin for Serendipity before 0.8 allows remote attackers to inject arbitrary web script or HTML via unknown vectors.