OverTheWire
The wargames offered by the OverTheWire community can help you to learn and practice security concepts in the form of fun-filled games.
Listed:
The Build App Online plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 1.0.21. This is due to missing authentication checking in the 'set_user_cart' function with the 'user_id' header value. This makes it possible for unauthenticated attackers to log in as any existing user on the site, such as an administrator, if they have access to the user id.