diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
index ccd172fbe5..a0861ee209 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
@@ -433,6 +433,11 @@ class WP_REST_Comments_Controller extends WP_REST_Controller {
 			return $prepared_comment;
 		}
 
+		// Do not allow comments to be created with a non-default type.
+		if ( ! empty( $request['type'] ) && 'comment' !== $request['type'] ) {
+			return new WP_Error( 'rest_invalid_comment_type', __( 'Cannot create a comment with that type.' ), array( 'status' => 400 ) );
+		}
+
 		/*
 		 * Do not allow a comment to be created with missing or empty
 		 * comment_content. See wp_handle_comment_submission().
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d192da5b12..c78f79d6ff 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-beta4-39289';
+$wp_version = '4.7-beta4-39290';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.