When restarting computer through a boot camped OS, Mac OS X does not request user to log into the computer, it is already unlocked.

I think I may have found a major security issue with bootcamp. When I restart my computer through windows 10, and it boots OS X on the restart, it never prompts me to input my password and it automatically logs me into my macbook. I fee that this is a major security error, and it needs to be addressed.