SQL injection vulnerability in exit.php for Serendipity 0.8 and earlier allows remote attackers to execute arbitrary SQL commands via the (1) url_id or (2) entry_id parameters.
https://exchange.xforce.ibmcloud.com/vulnerabilities/20119
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-1137
http://www.securityfocus.com/bid/13161
http://securitytracker.com/id?1013699