Some weird users in database

Question

I've noticed that I have some users that seem fraudulent in my database (in the wp_users column). And the curious thing is that they don't appear in the users list in the admin panel.

How could this happen?

many thanks

Answer 1

Might be this is due to the Spam. Diable use registration under the General -> Settings if you don't need registration on the front-end or use the captcha or other spam protection plugins.

Regarding the backend -> Have you checked the wp_usermeta table if any role assigned to those users or not? Check user roles for those users.