My Mac's Guest User has password, but I never made it?

Same exact problem - haven't had it on any of my other computers, but on my new Macbook Pro the guest account is asking for a password. I only use it when I travel so the rest of the time would like to make it available in the living room but not on my account - but as of now the guest account is useless...

log in as admin, and try to disable and re-enable guest account. Guest accounts require no passwords.

System preferences > users and groups > click the lock and type in admin info > disable guest user account.

Quest accounts im not sure about. but q and g look similar, perhaps they meant "g"uest account?

Ok. So after debugging this for a while, it turns out whatever fix Apple pushed to resolve the password less "root" bug in the second Security Fix 2017-001 update (17B1003, the one that fixes access shared network drives broken in 17B1002), also enabled the Guest User account for FileVault. That's the account with the wired icon. I inferred this as the account didn't show up while fast-user switching, only when booting up my MacBook which has FileVault enabled.

The second "normal" Guest User account is for guest sessions, which on FileVault enabled Macs just presents a Safari session for users.

The presence of this 'Guest User' account at boot up on FileVault enabled Macs allows that account to decrypt the FileVault for the OS to start. This is something I do not desire.

To prevent this, run the following in terminal to remove the Guest User from FileVault

sudo fdesetup remove -user Guest

This solved my problem.

Mine was already locked down before so I never got to experience this, but here two sites to review;

https://9to5mac.com/2017/11/28/how-to-set-root-password/

https://discussions.apple.com/thread/8097403?start=0&tstart=0

I'm having the same problem after I updated to high sierra. Is that a bug?

I have had the same problem but it is there all the time and the icon for it looks weird. When I do enable the guest user then another one will pop up and work normally, but if it's not enabled it will stay there and ask for a password. I am running OSX Sierra right now.

Did you lock System Preferences after turning off the Guest access and turning it back on?

I'm having the same issue.

Here's the strange looking "Guest User" account that requires a password.

tried vj.b suggestions, didn't help.

update:after disabling and re-enabling the guest account several times eventually it worked as expected. It's still a bug as it never should have asked for a password at all, but apparently persistence is key if you run across this problem!

Same problem here, it startet when I updated to high sierra

Yes. Same problem here. Started occurring after applying both 2017-001 security patches to High Sierra. Current build running is 17B1003. The icon looks weird too.

Thank you! Worked for me!