Short answer: This is safe as long as you keep the networking settings
("NAT") in the virtual machine the way they are set up.
Only the host computer can access the virtual machine if the networking is
set to NAT, so just like ssh port forwarding no other computer on the
network can access the virtual machine. However, if you change the
networking in VirtualBox (Settings->Network->Attached to:...) to, say,
"Bridged adapter" then all computers on the network can access the virtual
machine. In this case you should definitely set passwords in the virtual
machine.
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