Direct static code injection vulnerability in write.php in Admbook 1.2.2 and earlier allows remote attackers to execute arbitrary PHP code via the X-Forwarded-For HTTP header field, which is inserted into content-data.php.
https://www.exploit-db.com/exploits/1512
https://exchange.xforce.ibmcloud.com/vulnerabilities/24771
http://www.vupen.com/english/advisories/2006/0663