https://arstechnica.com/information-technology/2018/05/comcast-bug-made-it-shockingly-easy-to-steal-customers-wi-fi-passwords/

A security hole in a Comcast service-activation website allowed anyone to obtain a customer's Wi-Fi network name and password by entering the customer's account number and a partial street address, ZDNet reported yesterday.

The problem would have let attackers "rename Wi-Fi network names and passwords, temporarily locking users out" of their home networks, ZDNet wrote. Obviously, an attacker could also use a Wi-Fi network name and password to log into an unsuspecting Comcast customer's home network.