SQL injection vulnerability in the serendipity_checkCommentToken function in include/functions_comments.inc.php in Serendipity before 2.0.2, when "Use Tokens for Comment Moderation" is enabled, allows remote administrators to execute arbitrary SQL commands via the serendipity[id] parameter to serendipity_admin.php.
http://www.securitytracker.com/id/1033558
http://blog.s9y.org/archives/265-Serendipity-2.0.2-Security-Fix-Release.html