Dorking in google
click post_file.php
Go to csrf paste your site
Example:site.com/(path)/post_file.php
Post file =pic
/ new_image
Upload your file
Haply dafece
Live:
http://zollibolli.ch/web/scripts/php/post_file.php
https://jtillman.com/engines/gallery/backend/filedrop/post_file.php