Reporting a security vulnerability to an independent hotel.

I was staying at a mom and pop hotel in the middle of the woods.
Their WiFi went down and no one from front desk picked up.

I went to default router IP
Noted the make of router
Tried default user/pw combo, it worked.
I rebooted the router, net came back up.
Left admin page.

A few questions:

1. How big is this vulnerability if I was a malicious actor to,
A. The hotel
B. The guests

2. Chances of …

back back up cybersecurity default down hotel noted pop reporting router security security vulnerability vulnerability wifi