diff --git a/wp-includes/ms-files.php b/wp-includes/ms-files.php
index 42826ede61..d17d9f95f7 100644
--- a/wp-includes/ms-files.php
+++ b/wp-includes/ms-files.php
@@ -25,6 +25,11 @@ if ( '1' === $current_blog->archived || '1' === $current_blog->spam || '1' === $
 	die( '404 — File not found.' );
 }
 
+if ( ! defined( 'BLOGUPLOADDIR' ) ) {
+	status_header( 500 );
+	die( '500 — Directory not configured.' );
+}
+
 $file = rtrim( BLOGUPLOADDIR, '/' ) . '/' . str_replace( '..', '', $_GET['file'] );
 if ( ! is_file( $file ) ) {
 	status_header( 404 );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c09ffb73b0..407253d531 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.9-alpha-60955';
+$wp_version = '6.9-alpha-60956';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.