Directory traversal vulnerability in templates/header.php3 in phpMyAgenda 3.1 and earlier allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the language parameter, as demonstrated by a parameter value naming an Apache HTTP Server log file that apparently contains PHP code.
https://www.exploit-db.com/exploits/2500
https://exchange.xforce.ibmcloud.com/vulnerabilities/29413