[ProllyInfamous]

For all users reading this on their own home network: DISABLE ALL GUEST NETWORKS

It seems as if approved guest access now == system-wide access (at the hardware level). User compartmentalization no longer works.

[pluralmonad]

Is this still true if the guest network is on its own isolated vlan?

[ProllyInfamous]

Correct; this appears to be a hardware-level problem.