My garage door just opened by itself..

[Matej]

If your remote-controlled garage door was not installed yesterday, then chances are it is not secure.
If people can hack into computers with all of today's sophisticated security, then I imagine hacking dinosaur technology such as a garage door remote is babytown frolics. There are even guides on how to do it online. And the older the system, the easier it is.
Even when it comes to the most recently installed systems, I would assume the installer and door companies have ways and backdoors to open them, which I am sure could easily fall into the wrong hands.

Now that I am done scaring you, garage doors kind of suck and they also malfunction all the time. Ours has opened by itself before.
Or was it by itself? Who knows...