You probably used a key login variable in the wrong scope.
Typically, Variables or Application in place of Session, Client or
Cookie. You cannot be logged into a site for everyone. Coldfusion
stores login details in session scope or in cookie scope. Normally,
everyone has their own session and/or cookie, and so the sharing of
login should not occur.
Place the link <a href="logout.cfm">log me
out</a> on any page from which you might wish to log out.
Create the page logout.cfm. It contains just one line of code,
namely
<cflogout>
Whenever you click on the link Coldfusion will log you out.