It used to be, and was recently changed after they realized that even PHP had disabled `register_globals` years ago (also, after they realized even Github, one of the biggest Rails site out there, had left this hole wide open and a guy used it to demonstrate the issues on the rails repo/account, which was very funny drama: https://github.com/rails/rails/issues/5239 http://erratasec.blogspot.be/2012/03/rubygithub-hack-transla...)