ThinkPHP before 3.2.4, as used in Open Source BMS v1.1.1 and other products, allows Remote Command Execution via public//?s=index/\think\app/invokefunction&function=call_user_func_array&vars[0]=system&vars[1][]= followed by the command.
https://www.exploit-db.com/exploits/46488/
https://github.com/xiayulei/open_source_bms/issues/33
http://packetstormsecurity.com/files/157218/ThinkPHP-5.0.23-Remote-Code-Execution.html