Directory traversal vulnerability in inc/includes.inc in GuppY 4.6.3 allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the selskin parameter to index.php. NOTE: this can be leveraged for remote file inclusion by including inc/boxleft.inc and specifying a URL in the xposbox[L][] array parameter.
https://www.exploit-db.com/exploits/4602
https://exchange.xforce.ibmcloud.com/vulnerabilities/38255
https://euvd.enisa.europa.eu/vulnerability/EUVD-2007-5814