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?
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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.