PHP remote file inclusion vulnerability in custom_vars.php in GlossWord 1.8.1 allows remote attackers to execute arbitrary PHP code via a URL in the sys[path_addon] parameter.
https://www.exploit-db.com/exploits/3935
https://exchange.xforce.ibmcloud.com/vulnerabilities/34330
http://www.vupen.com/english/advisories/2007/1852