If you need to access your cameras remotely, do so through a Virtual Private Network (VPN) rather than exposing the device directly to the internet.
Manufacturers frequently release patches to fix security holes. Check for updates at least once a quarter. inurl+viewerframe+mode+motion+hotel+extra+quality
Manually configure your router and disable Universal Plug and Play to prevent devices from opening ports without your knowledge. If you need to access your cameras remotely,
The keyword string you mentioned is a form of "Google Dorking." This involves using advanced search operators to find information that isn't intended for public viewing but has been indexed by search engines. inurl+viewerframe+mode+motion+hotel+extra+quality
Many establishments use older IP cameras that lack modern encryption.