diff --git a/src/wp-includes/class-wp-xmlrpc-server.php b/src/wp-includes/class-wp-xmlrpc-server.php
index d269655716..1c9ec17f33 100644
--- a/src/wp-includes/class-wp-xmlrpc-server.php
+++ b/src/wp-includes/class-wp-xmlrpc-server.php
@@ -3684,7 +3684,7 @@ class wp_xmlrpc_server extends IXR_Server {
 		}
 
 		if ( ! $comment_ID ) {
-			return new IXR_Error( 403, __( 'An unknown error occurred' ) );
+			return new IXR_Error( 403, __( 'An unidentified error has occurred.' ) );
 		}
 
 		/**
diff --git a/src/wp-includes/script-loader.php b/src/wp-includes/script-loader.php
index 84aab60b68..ba82655d47 100644
--- a/src/wp-includes/script-loader.php
+++ b/src/wp-includes/script-loader.php
@@ -816,7 +816,7 @@ function wp_default_scripts( &$scripts ) {
 				'activateImporter'           => __( 'Run Importer' ),
 				/* translators: %s: Importer name */
 				'activateImporterLabel'      => __( 'Run %s' ),
-				'unknownError'               => __( 'An unknown error occurred' ),
+				'unknownError'               => __( 'An unidentified error has occurred.' ),
 				'connectionError'            => __( 'Connection lost or the server is busy. Please try again later.' ),
 				'nonceError'                 => __( 'An error has occurred. Please reload the page and try again.' ),
 				'pluginsFound'               => __( 'Number of plugins found: %d' ),