diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-controller.php
index 0cb54c91ed3de..e3057e75d86b8 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-controller.php
@@ -327,10 +327,12 @@ public function prepare_item_for_response( $post, $request ) {
 		}
 		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/src/wp-includes/rest-api/endpoints/class-wp-rest-menu-items-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-menu-items-controller.php
index 4119b6530e91e..9fbaa95371b54 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-menu-items-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-menu-items-controller.php
@@ -510,6 +510,7 @@ public function prepare_item_for_response( $item, $request ) {
 
 		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 @@ public function prepare_item_for_response( $item, $request ) {
 			$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/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
index e5420c74fb3ea..d6afdef470af2 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
@@ -1844,10 +1844,12 @@ public function prepare_item_for_response( $item, $request ) {
 		}
 		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 @@ public function prepare_item_for_response( $item, $request ) {
 	}
 
 	/**
-	 * 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/src/wp-includes/rest-api/search/class-wp-rest-post-search-handler.php b/src/wp-includes/rest-api/search/class-wp-rest-post-search-handler.php
index 58b36506e7d9f..fff921f749e07 100644
--- a/src/wp-includes/rest-api/search/class-wp-rest-post-search-handler.php
+++ b/src/wp-includes/rest-api/search/class-wp-rest-post-search-handler.php
@@ -132,8 +132,10 @@ public function prepare_item( $id, array $fields ) {
 		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 @@ public function prepare_item_links( $id ) {
 	}
 
 	/**
-	 * 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/tests/phpunit/includes/testcase-rest-post-type-controller.php b/tests/phpunit/includes/testcase-rest-post-type-controller.php
index 9b1d366315bc4..75326284e6e5d 100644
--- a/tests/phpunit/includes/testcase-rest-post-type-controller.php
+++ b/tests/phpunit/includes/testcase-rest-post-type-controller.php
@@ -107,8 +107,10 @@ protected function check_post_data( $post, $data, $context, $links ) {
 		// Check filtered values.
 		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' ) );
 			$this->assertSame( get_the_title( $post->ID ), $data['title']['rendered'] );
 			remove_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+			remove_filter( 'private_title_format', array( $this, 'protected_title_format' ) );
 			if ( 'edit' === $context ) {
 				$this->assertSame( $post->post_title, $data['title']['raw'] );
 			} else {
diff --git a/tests/phpunit/tests/rest-api/wpRestMenuItemsController.php b/tests/phpunit/tests/rest-api/wpRestMenuItemsController.php
index 53d52350b6b1c..5508123deac19 100644
--- a/tests/phpunit/tests/rest-api/wpRestMenuItemsController.php
+++ b/tests/phpunit/tests/rest-api/wpRestMenuItemsController.php
@@ -862,8 +862,10 @@ protected function check_menu_item_data( $post, $data, $context, $links ) {
 		// Check filtered values.
 		if ( post_type_supports( self::POST_TYPE, 'title' ) ) {
 			add_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+			add_filter( 'private_title_format', array( $this, 'protected_title_format' ) );
 			$this->assertSame( $post->title, $data['title']['rendered'] );
 			remove_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
+			remove_filter( 'private_title_format', array( $this, 'protected_title_format' ) );
 			if ( 'edit' === $context ) {
 				$this->assertSame( $post->title, $data['title']['raw'] );
 			} else {