Have you been living in a cave? This has been going on for months, if not years and most people who check Meta should be aware of it. e.g. theymos added the option to lock the account via email once the password changes and similar.
You can safely lock this thread.
I'm not living in a cave... and seems you didn't read what I wrote.
I'm talking about accounts with mails like
accoskjrkdlkaoi32@gmail.com who are
NOT yet registered till now. Mine was like this before change it today.
I think hackers are now checking the dump for weird looking emails and then they are registering. theymos functions is useless in this case because by this hackers are getting the original associated with accounts mails.
This is only way I can exlain to myself the whole bunch of "password reset via email" lines in Security Log.