I am owner of Honda CRV 2018. A few days ago early morning I have noticed that all windows including sunroof were opened unintentionally.

Vehicles have a function on the Keyfob when you hold down the open button for more than a few seconds, the windows and sunroof open. It's great when walking to the vehicle on a hot day. You must have activated the button somehow.

My vehicle has 4 functions on the Keyfob: "Tailgate button", "Lock button", "unlock button", "Panic button" and "Engine button". "Lock button" and "unlock button" used to open door (s). "Tailgate button" - uses to open tailgate. My vehicle does not have a function on the Keyfob to open remotly the windows and sunroof. What open button you mentioned about? Open doors button?