Before the update was released to address the problem, the flaw created a huge problem that enables anyone, anywhere to hack you just by typing a single word.
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Security researchers disclosed a bug Tuesday that facilitates instant hacking by typing the word "root" as a username with a blank password. Once someone clicked the unlock button two times -- you have instant access.
RELATED: Do you have the newest Mac operating system? Anyone can hack you right now
This bug was dangerous because it allowed any user anywhere to gain entrance to your files and your saved information on your computer.
Experts had been concerned that malware could gain root access this way and screw up computers in a royal way quicker than ever before.
Cyber security expert Melody Moh, a professor at San Jose State University, called Apple's security flaw "mind blowing."
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Apple unveiled High Sierra on Sept. 25.
It came pre-installed on a handful of computer models.
Click here to read more about the update Apple released on their website.