I woke up this morning to see that my Mac had updated its OS and had apparently created a "Temporary account" with admin privileges. I've deleted the account.
I woke up this morning to see that my Mac had updated its OS and had apparently created a "Temporary account" with admin privileges. I've deleted the account.
I think I've solved the mystery. I set it up a few months ago. But I deleted it shortly afterwards. Somehow it came back to life when the OS updated itself.