Ticket #21931: 21931.8.diff

src/wp-includes/template-loader.php

@@ -86 +86 @@
          */
         if ( $template = apply_filters( 'template_include', $template ) ) {
                 include( $template );
-        } elseif ( is_user_logged_in() ) {
+        } elseif ( current_user_can( 'install_themes' ) ) {
                 $theme = wp_get_theme();
                 if ( $theme->errors() ) {
                         wp_die( $theme->errors() );