ipchat.php in Invision Power Board 1.1.1 allows remote attackers to execute arbitrary PHP code, if register_globals is enabled, by modifying the root_path parameter to reference a URL on a remote web server that contains the code.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11435
https://euvd.enisa.europa.eu/vulnerability/EUVD-2003-1375
http://www.securityfocus.com/bid/6976
http://secunia.com/advisories/8182
http://archives.neohapsis.com/archives/vulnwatch/2003-q1/0099.html