PHP remote file inclusion vulnerability in function.php in Ultimate Fun Book 1.02 allows remote attackers to execute arbitrary PHP code via a URL in the gbpfad parameter. NOTE: some sources mention "Ultimate Fun Board," but this appears to be an error.
https://www.exploit-db.com/exploits/3336
https://exchange.xforce.ibmcloud.com/vulnerabilities/32584
http://www.vupen.com/english/advisories/2007/0675