iCloud Keychain Hacked?

Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?

ChandraNimsBrown wrote:

When using auto fill my user name and passwords information has been replaced with a series of characters I did not create.

I tried deleting in System Preferences, the information returned. I then cleared cache and cookies and tried again to delete In system preferences. Same thing, website address was back with wrong user name and password characters.

I deleted all password information in Keychain (about 1900 passwords), cleared cache and cookies while disconnected from WiFi. I shut down my MacBook Pro and restarted.

Again, keychain has all the information back. The user name and password information is the same when I open an entry.

MacBook Pro 15″, macOS 10.15

What macOS exactly?

Is the keychain information working as expected...? You do not say.

Are you running Beta software...?

Are you using the Advanced Security

Security Keys for Apple ID, and Advanced Data Protection for iCloud

provide users with important new tools to protect their most sensitive

data and communications

Apple advances user security with powerful new data protections - Apple

About Security Keys for Apple ID - Apple Support

Use security keys to sign in to your Apple ID account on ...

Use security keys for two-factor authentication on Mac