source: https://www.securityfocus.com/bid/9670/info

It has been reported that ShopcartCGI is prone to a remote file disclosure vulnerability. This issue is due to insufficient validation of user-supplied input.

Upon successful exploitation of this issue an attacker may be able to gain access to sensitive system files, potentially facilitating further attacks.

http://www.example.com/directory/genindexpage.cgi?13687+Home+/../../../../../../../../../../../../../../../../etc/passwd