Apple has fixed two vulnerabilities in its Mac operating system that put passwords at risk of theft by hackers.
The company released the security fix Thursday, an Apple spokesperson told ZDNet.
Synack's Patrick Wardle, who was credited with finding one of the now-fixed vulnerabilities, revealed a password-stealing bug just hours before High Sierra was released.
The bug let an attacker grab and steal every password in plain text using a malicious, unsigned app downloaded from the internet -- without needing the user's master Keychain password.
Apple fixed the bug by requiring users to enter their password before unlocking their Keychain.
Thursday's security update also fixed another security vulnerability affecting encrypted volumes using Apple's new file system, APFS, in which the volume's password was stored as the password hint and could be revealed in plain text.
Apple acknowledged Matheus Mariano for finding the bug.