PHP remote file inclusion vulnerability in archive/archive_topic.php in pbpbb archive for search engines (SearchIndexer) (aka phpBBSEI) for phpBB allows remote attackers to execute arbitrary PHP code via a URL in the phpbb_root_path parameter.
https://www.exploit-db.com/exploits/2549
https://exchange.xforce.ibmcloud.com/vulnerabilities/29569
http://www.vupen.com/english/advisories/2006/4037
http://www.securityfocus.com/archive/1/448621/100/0/threaded