Google has just issued an emergency update to Mac Google Chrome. For a variety of reasons, you should also update Chrome if you have it on your iPhone or iPad.
Google Chrome normally auto-updates, but a) it only updates if you launch it, and it checks for an update, finds it, installs it, and you relaunch, and b) most people don’t do what is required to comply with a).
Solution: launch Google Chrome, go to the Chrome menu and select About Google Chrome, make sure auto updates is on, and make sure you are using 105.0.5195.102 or later. The update is also required for Windows and Linux.
This is a zero-day update, meaning that Chrome was being actively compromised before Google realized there was a problem. Your Mac’s security updates do not cover Chrome; you have to assume responsibility for updating third-party software.
For more not-terribly-useful information, please see https://chromereleases.googleblog.com/2022/09/stable-channel-update-for-desktop.html