SQL injection vulnerability in member_login.php in PHP Classifieds 6.18 through 6.20 allows remote attackers to execute arbitrary SQL commands via the (1) username parameter, which is used by the E-mail address field, and (2) password parameter.
http://www.vupen.com/english/advisories/2006/0600
http://www.securityfocus.com/archive/1/424955/100/0/threaded
http://www.deltascripts.com/board/viewtopic.php?id=7234