Turns out that High Sierra, Apple MacOS, had a few big flaws.
How big? Well, they exposed users passwords.
One of them let “Show password hint” feature just display your password. As explained by Naked Security, if you created a new APFS (Apple File System) encrypted volume on High Sierra and set a hint, your password would be exposed.
— Felix Schwarz (@felix_schwarz) October 5, 2017
Another bug, according to Gizmodo, “made it possible for an attacker to extract passwords from Apple’s Keychain in plaintext.”
“A method existed for applications to bypass the keychain access prompt with a synthetic click. This was addressed by requiring the user password when prompting for keychain access,” Apple says in the release notes for the update.