zzcms 8.2 allows remote attackers to discover the full path via a direct request to 3/qq_connect2.0/API/class/ErrorCase.class.php or 3/ucenter_api/code/friend.php.
https://kongxin.gitbook.io/zzcms-8-2-bug/
https://github.com/kongxin520/zzcms/blob/master/zzcms_8.2_bug.md