accessing Keychain Access from terminal - OSX

I am on OSX and using my terminal to access my Keychain Access. So I use this command

security find-internet-password -a myaccount -s myservice -g

and it works correctly but before I can get the response to this query, there is a pop-up showing and telling me that security wants to use confidential data kept in the Keychain... (translated from french). Why is it so ? How can I desactivate it ?

Btw, I tried to ssh to my own computer, in order to prevent the popup to show, but then I got no output when I ran the same command...