--- a/wp/wp-admin/custom-background.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-admin/custom-background.php	Fri Sep 05 18:52:52 2025 +0200
@@ -9,6 +9,11 @@
  * @subpackage Administration
  */
 
+// Don't load directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	die( '-1' );
+}
+
 _deprecated_file( basename( __FILE__ ), '5.3.0', 'wp-admin/includes/class-custom-background.php' );
 
 /** Custom_Background class */