Business Logic Flaws

http://ashishpadelkar.com/index.php/2015/09/23/facebook-simple-technical-bug-worth-7500/

https://www.arneswinnen.net/2016/07/how-i-could-steal-money-from-instagram-google-and-microsoft/

http://www.anandpraka.sh/2015/12/summary-this-blog-post-is-about.html

https://blog.darabi.me/2015/03/facebook-bypass-ads-account-roles.html

http://www.anandpraka.sh/2017/03/how-anyone-could-have-used-uber-to-ride.html