REST API: check parent and revision ids match before retrieving revision.

Adds a condition to check that parent id matches revision parent id in `WP_REST_Revisions_Controller` `get_item` method.

Props ramonopoly, adamsilverstein, danielbachhuber, spacedmonkey, andrewserong.
Fixes #59875.

Built from https://develop.svn.wordpress.org/trunk@57222


git-svn-id: http://core.svn.wordpress.org/trunk@56728 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php

@@ -387,6 +387,7 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 	 * Retrieves one revision from the collection.
 	 *
 	 * @since 4.7.0
+	 * @since 6.5.0 Added a condition to check that parent id matches revision parent id.
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
@@ -402,6 +403,15 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 			return $revision;
 		}
 
+		if ( (int) $parent->ID !== (int) $revision->post_parent ) {
+			return new WP_Error(
+				'rest_revision_parent_id_mismatch',
+				/* translators: %d: A post id. */
+				sprintf( __( 'The revision does not belong to the specified parent with id of "%d"' ), $parent->ID ),
+				array( 'status' => 404 )
+			);
+		}
+
 		$response = $this->prepare_item_for_response( $revision, $request );
 		return rest_ensure_response( $response );
 	}

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57221';
+$wp_version = '6.5-alpha-57222';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.