phpscheduleit Booked Scheduler 2.7.5 allows arbitrary file upload via the Favicon field, leading to execution of arbitrary Web/custom-favicon.php PHP code, because Presenters/Admin/ManageThemePresenter.php does not ensure an image file extension.
https://www.exploit-db.com/exploits/46486
https://sourceforge.net/p/phpscheduleit/source/ci/c5a86a279d888bd4362e4b4f61acedc054f99c39/
https://pentest.com.tr/exploits/Booked-2-7-5-Remote-Command-Execution-Metasploit.html
http://packetstormsecurity.com/files/165263/Booked-Scheduler-2.7.5-Shell-Upload.html