Developers and beta users should update to beta 6 as soon as possible to protect Mac computers from malicious attacks.
For this mistake, Apple has sincerely apologized to all Mac users, and promised to review the system development process to prevent similar incidents from happening again.
Security is crucial to every Apple product, and unfortunately we made a mistake on this macOS update. When our security engineer realized the problem yesterday afternoon, we immediately started to prepare for updates and bug fixes. At 8 am this morning, security updates have been pushed and patches will now automatically be installed on systems running macOS High Sierra 10.13.1. We regret that this error has occurred and we apologize to all Mac users for not only apologizing for such a vulnerability but also apologizing for the concern that has been raised. We are reviewing our development process to prevent this from happening again.