CSRF on https://apps.topcoder.com/wiki/users/editmyprofilepicture.action

How it was found

Summary:

Hi :) There is a CSRF on uploading user profile photo and saving it.

Steps To Reproduce:

There is no CSRF token or anything like that on https://apps.topcoder.com/wiki/users/editmyprofilepicture.action . I added the poc html files below. Attacker can upload a new profile photo and update victim's profil photo.

Note: This only works to signed-in users. Because unauthorized users cannot upload attachments. There is a mistake on https://apps.topcoder.com/wiki/login.action now. If you encounter an error, you can login on main site (https://accounts.topcoder.com/member) then try.

Impact

An attacker can force other users to change their profile pictures without their knowledge.