SQL injection vulnerability in usersession in CommodityRentals 2.0 Online Rental Business Creator script allows remote attackers to execute arbitrary SQL commands via the user_id parameter.
http://www.vupen.com/english/advisories/2005/2547
http://secunia.com/advisories/17665
http://pridels0.blogspot.com/2005/11/commodity-rentals-2x-userid-sql-inj.html