diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-controller.php
index 0cb54c91ed..e3057e75d8 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-controller.php
@@ -327,10 +327,12 @@ class WP_REST_Global_Styles_Controller extends WP_REST_Posts_Controller {
 		}
 		if ( rest_is_field_included( 'title.rendered', $fields ) ) {
 			add_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+			add_filter( 'private_title_format', array( $this, 'protected_title_format' ) );
 
 			$data['title']['rendered'] = get_the_title( $post->ID );
 
 			remove_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+			remove_filter( 'private_title_format', array( $this, 'protected_title_format' ) );
 		}
 
 		if ( rest_is_field_included( 'settings', $fields ) ) {
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-menu-items-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-menu-items-controller.php
index 4119b6530e..9fbaa95371 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-menu-items-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-menu-items-controller.php
@@ -510,6 +510,7 @@ class WP_REST_Menu_Items_Controller extends WP_REST_Posts_Controller {
 
 		if ( rest_is_field_included( 'title.rendered', $fields ) ) {
 			add_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+			add_filter( 'private_title_format', array( $this, 'protected_title_format' ) );
 
 			/** This filter is documented in wp-includes/post-template.php */
 			$title = apply_filters( 'the_title', $menu_item->title, $menu_item->ID );
@@ -517,6 +518,7 @@ class WP_REST_Menu_Items_Controller extends WP_REST_Posts_Controller {
 			$data['title']['rendered'] = $title;
 
 			remove_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+			remove_filter( 'private_title_format', array( $this, 'protected_title_format' ) );
 		}
 
 		if ( rest_is_field_included( 'status', $fields ) ) {
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
index e5420c74fb..d6afdef470 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
@@ -1844,10 +1844,12 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 		}
 		if ( rest_is_field_included( 'title.rendered', $fields ) ) {
 			add_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+			add_filter( 'private_title_format', array( $this, 'protected_title_format' ) );
 
 			$data['title']['rendered'] = get_the_title( $post->ID );
 
 			remove_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+			remove_filter( 'private_title_format', array( $this, 'protected_title_format' ) );
 		}
 
 		$has_password_filter = false;
@@ -2047,15 +2049,15 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 	}
 
 	/**
-	 * Overwrites the default protected title format.
+	 * Overwrites the default protected and private title format.
 	 *
-	 * By default, WordPress will show password protected posts with a title of
-	 * "Protected: %s", as the REST API communicates the protected status of a post
-	 * in a machine-readable format, we remove the "Protected: " prefix.
+	 * By default, WordPress will show password protected or private posts with a title of
+	 * "Protected: %s" or "Private: %s", as the REST API communicates the status of a post
+	 * in a machine-readable format, we remove the prefix.
 	 *
 	 * @since 4.7.0
 	 *
-	 * @return string Protected title format.
+	 * @return string Title format.
 	 */
 	public function protected_title_format() {
 		return '%s';
diff --git a/wp-includes/rest-api/search/class-wp-rest-post-search-handler.php b/wp-includes/rest-api/search/class-wp-rest-post-search-handler.php
index 58b36506e7..fff921f749 100644
--- a/wp-includes/rest-api/search/class-wp-rest-post-search-handler.php
+++ b/wp-includes/rest-api/search/class-wp-rest-post-search-handler.php
@@ -132,8 +132,10 @@ class WP_REST_Post_Search_Handler extends WP_REST_Search_Handler {
 		if ( in_array( WP_REST_Search_Controller::PROP_TITLE, $fields, true ) ) {
 			if ( post_type_supports( $post->post_type, 'title' ) ) {
 				add_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+				add_filter( 'private_title_format', array( $this, 'protected_title_format' ) );
 				$data[ WP_REST_Search_Controller::PROP_TITLE ] = get_the_title( $post->ID );
 				remove_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+				remove_filter( 'private_title_format', array( $this, 'protected_title_format' ) );
 			} else {
 				$data[ WP_REST_Search_Controller::PROP_TITLE ] = '';
 			}
@@ -183,15 +185,15 @@ class WP_REST_Post_Search_Handler extends WP_REST_Search_Handler {
 	}
 
 	/**
-	 * Overwrites the default protected title format.
+	 * Overwrites the default protected and private title format.
 	 *
-	 * By default, WordPress will show password protected posts with a title of
-	 * "Protected: %s". As the REST API communicates the protected status of a post
-	 * in a machine-readable format, we remove the "Protected: " prefix.
+	 * By default, WordPress will show password protected or private posts with a title of
+	 * "Protected: %s" or "Private: %s", as the REST API communicates the status of a post
+	 * in a machine-readable format, we remove the prefix.
 	 *
 	 * @since 5.0.0
 	 *
-	 * @return string Protected title format.
+	 * @return string Title format.
 	 */
 	public function protected_title_format() {
 		return '%s';
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5d89d646c3..d890144262 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58782';
+$wp_version = '6.7-alpha-58783';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.