I just noticed something that makes me concerned about my site's security, and wonder if anyone knows about it:
While doing some work in phpMyAdmin, in the user_meta table, I noticed several rows which had user_ids which do not exist in the users table, and have user_level 10 (administrative).
Near these rows, there are some first_name values of "..." which I guess are blank.
I am mystified and slightly worried. Could these entries be:
a) The aftermath of having gotten hacked in the past (which I was, and had to delete some illegitimate admin users);
b) something currently wrong with the table;
c) the result of some legitimate process from either WordPress or a plugin?
Many thanks to anyone with even the slightest clue,
Jessi