PHP remote file inclusion vulnerability in day.php in ACal 2.2.6 allows remote attackers to execute arbitrary PHP code via a URL in the path parameter.
https://www.exploit-db.com/exploits/1763
https://exchange.xforce.ibmcloud.com/vulnerabilities/26278
https://euvd.enisa.europa.eu/vulnerability/EUVD-2006-2262
http://www.vupen.com/english/advisories/2006/1692