@kevinprotoss thanks a lot for your reply, but unfortunately my other app isn't a node app so i can't use oauth2orize. However, i take a cue from your suggestions for a solution.

Thanks for yours reply, but this plugin is "allows users to login/register via any configured OAuth provider".
In my case i don't want deploy an oauth provider only for this task. There is another way? For example a rest service that return to me a session cookie.
If i can do a curl post to the /login url with user, password and a valid token i solve my problem by adding programmatically the cookie to my session. Obviously to do this i must create a nodebb user programmatically, can i do that?
I've found this one http://community.nodebb.org/topic/916/shared-authentication-between-two-node-apps-when-using-mongodb#6564

Hi all and compliments for NodeBB.
I would connect the nodebb login system with the login of one of my web application.
How can i do a SSO through applications and nodeBB?

Thanks in advance