https://www.cnet.com/news/comcast-bug-would-tell-anyone-your-wi-fi-name-and-password/

A website meant to set up Xfinity internet service may have exposed customers' Wi-Fi names and passwords. Luckily, Comcast already has this bug under control.

The Xfinity site asked for a person's account ID and home address in order to activate that home's router, but once you entered this information it showed that home's router name and password in plaintext, reported ZDNet on Monday. You could use this service to get anyone's Wi-Fi name and password as long as you had their account ID or address -- both easily available in any discarded bill.