diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/class-wp-rewrite.php
--- a/wp/wp-includes/class-wp-rewrite.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-includes/class-wp-rewrite.php	Fri Sep 05 18:52:52 2025 +0200
@@ -1287,6 +1287,9 @@
 		// favicon.ico -- only if installed at the root.
 		$favicon_rewrite = ( empty( $home_path['path'] ) || '/' === $home_path['path'] ) ? array( 'favicon\.ico$' => $this->index . '?favicon=1' ) : array();
 
+		// sitemap.xml -- only if installed at the root.
+		$sitemap_rewrite = ( empty( $home_path['path'] ) || '/' === $home_path['path'] ) ? array( 'sitemap\.xml' => $this->index . '??sitemap=index' ) : array();
+
 		// Old feed and service files.
 		$deprecated_files = array(
 			'.*wp-(atom|rdf|rss|rss2|feed|commentsrss2)\.php$' => $this->index . '?feed=old',
@@ -1449,9 +1452,9 @@
 
 		// Put them together.
 		if ( $this->use_verbose_page_rules ) {
-			$this->rules = array_merge( $this->extra_rules_top, $robots_rewrite, $favicon_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $page_rewrite, $post_rewrite, $this->extra_rules );
+			$this->rules = array_merge( $this->extra_rules_top, $robots_rewrite, $favicon_rewrite, $sitemap_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $page_rewrite, $post_rewrite, $this->extra_rules );
 		} else {
-			$this->rules = array_merge( $this->extra_rules_top, $robots_rewrite, $favicon_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $post_rewrite, $page_rewrite, $this->extra_rules );
+			$this->rules = array_merge( $this->extra_rules_top, $robots_rewrite, $favicon_rewrite, $sitemap_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $post_rewrite, $page_rewrite, $this->extra_rules );
 		}
 
 		/**
@@ -1498,7 +1501,8 @@
 
 	/**
 	 * Refreshes the rewrite rules, saving the fresh value to the database.
-	 * If the `wp_loaded` action has not occurred yet, will postpone saving to the database.
+	 *
+	 * If the {@see 'wp_loaded'} action has not occurred yet, will postpone saving to the database.
 	 *
 	 * @since 6.4.0
 	 */
@@ -1510,7 +1514,7 @@
 
 		if ( ! did_action( 'wp_loaded' ) ) {
 			/*
-			 * Is not safe to save the results right now, as the rules may be partial.
+			 * It is not safe to save the results right now, as the rules may be partial.
 			 * Need to give all rules the chance to register.
 			 */
 			add_action( 'wp_loaded', array( $this, 'flush_rules' ) );