Direct static code injection vulnerability in postpost.php in Dayfox Blog (dfblog) 4 allows remote attackers to execute arbitrary PHP code via the cat parameter, which can be executed via a request to posts.php.
https://www.exploit-db.com/exploits/3478
http://www.vupen.com/english/advisories/2007/0969
http://www.securityfocus.com/bid/22972