- existing wiki "User" account with a confirmed e-mail address. This account was created earlier via createaccount or createaccount-by-mail, a standard mediawiki account ;
- User wants to attach their XYZ-OpenID to their account because there is no OpenID yet ; and
- User has forgotten the password for the wiki User account
User can send a temporary password via Special:PasswordReset to their (previously confirmed) e-mail address.
A password is mandatory when you want to attach an OpenID to an existing account.
Current OpenID version do not accept the _temporary_ password when attaching an OpenID to an existing account.