Cross-site request forgery (CSRF) vulnerability in the Entry Manager in Serendipity before 1.0-beta3 allows remote attackers to perform unauthorized actions as a logged-in user via a link or IMG tag.
http://www.vupen.com/english/advisories/2006/1855
http://sourceforge.net/project/shownotes.php?release_id=414920&group_id=75065