Mystery File – hosting_provider_filters.php


While doing a quarterly WordPress update for a customer, we spotted a mystery file at the root of the WordPress installation. It’s a hosting_provider_filters.php file.

Some Internet research cleared up the mystery.  The file is often installed by BlueHost as a security measure against DDOS attacks.  (Click here and here for the technical details.)  The file isn’t a core WordPress file, but it’s not malware either.

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