WordPress at a glance
action is not described

submitpost_box action-hook . WP 2.5.0

Fires before meta boxes with 'side' context are output for all post types other than 'page'.

The submitpost box is a meta box with 'side' context, so this hook fires just before it is output.

Usage

add_action( 'submitpost_box', 'action_function_name_9327' );
function action_function_name_9327( $post ){
	// action...
}
$post(WP_Post)
Post object.

Where the hook is called

In file: /wp-admin/edit-form-advanced.php
submitpost_box
wp-admin/edit-form-advanced.php 569
do_action( 'submitpost_box', $post );

Where the hook is used (in WP core)

Does not used.