Yes, it is if you are using the public render server.
> Is there a way to use the already loged in user to be the user of the variable $wgCollectionMWServeCredential
> Probably something like this:
> $wgCollectionMWServeCredentials="$wgUserName:PASSWORD_ENCRYPTED:DOMAIN"
What do you mean by "already logged in"? As long as mw-serve doesn't share your local browser cookie, there's no already logged in user.
You might want to use your own render server and grant access by some other means (e.g. in your web server config via IPs or network interfaces).
-- Johannes Beigel
You could create a new account only used by the render server. You'd still have to put the password in cleartext in your MediaWiki config, but that should be readable by some admins anyway. And it's not an employee's password.
Alternatively, you provide (somehow, that's up to you) internal access to your MediaWiki that's not password-restricted.
-- Johannes Beigel