Is Wi-Fi Direct secure by default on the HP Envy Photo 7800?
By default, Wi-Fi Direct is set to 'Automatic' mode without an administrator password, which allows anyone within wireless range to connect and access all printer functions and settings. HP recommends changing the Wi-Fi Direct Connection Method from 'Automatic' to 'Manual' and establishing an administrator password if higher security is desired. Security settings can be changed from the printer's embedded web server (EWS).
From the official HP Envy Photo 7800 All-in-One Printer manual, page 2
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