Multiple orders attack | WordPress.org

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I’ve just discovered thousands of failed WooCommerce orders on this site along with nearly 4000 new registered customers. I’ve updated all WordPress and all plugins on the site and blocked the IP address from where this attack is coming but I’m concerned that this could resume from a different IP. Is there a way to prevent this?
The WooCommerce versiion was 4.5.5, quite old. Could this issue have been picked up in recent versions?

And finally, is there a quick way of deleting several thousand customers and failed orders, without deleting the legitimate ones

The page I need help with: [log in to see the link]

 

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