SQL injection vulnerability in BackLinkSpider allows remote attackers to execute arbitrary SQL commands via the cat_id parameter to a site-specific component name such as link.php or backlinkspider.php.
https://www.exploit-db.com/exploits/5546
https://exchange.xforce.ibmcloud.com/vulnerabilities/42189
http://www.securityfocus.com/archive/1/491612/100/0/threaded