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Asking them to update their password would be my first thought. You could also enable the Force all members to use strong passwords option on the Wordfence > Firewall > All Firewall Options page on your site in the Brute Force Protection > Additional Options section to prevent this from happening in the future.
Mia
Actually, there were 500+ users. I suggest Wordfence to introduce a system to force changing password after three-six months.
I am going to mark this topic as resolved now.
Please refer to Mia’s response above.
- This reply was modified 2 minutes ago by . Reason: Removed response as topic marked resolved