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I figured out how to do it now. Using the API documentation here is quite good:

https://ultimatemember.com/php-docs/classes/UM.html

add_action( 'gform_after_submission_2', 'after_submission_change_role', 10, 2 );
function after_submission_change_role($entry, $form) {
	$user_id = get_current_user_id();
	UM()->roles()->set_role( $user_id, 'um_full-member' );
}

Thanks!

I had the same thing. I am using wp 2.5.1 on the site. When upgrading to 2.7.1 ran into problems on another site so didn’t yet upgrade yet.

In fact the one with 2.7.1 has been hacked too. I can’t even get back into the back-end at the moment.