diff --git a/js/customize-snapshots.js b/js/customize-snapshots.js
index 4dda53b2..58f7ef43 100644
--- a/js/customize-snapshots.js
+++ b/js/customize-snapshots.js
@@ -557,7 +557,7 @@
 			}
 		} );
 
-		request.done( function() {
+		request.done( function( response ) {
 			var url = api.previewer.previewUrl(),
 				regex = new RegExp( '([?&])customize_snapshot_uuid=.*?(&|$)', 'i' ),
 				notFound = -1,
@@ -590,7 +590,8 @@
 			api.trigger( 'customize-snapshots-update', {
 				previewUrl: url,
 				customizeUrl: customizeUrl,
-				uuid: component.data.uuid
+				uuid: component.data.uuid,
+				response: response
 			} );
 		} );
 
diff --git a/php/class-customize-snapshot-manager.php b/php/class-customize-snapshot-manager.php
index 9d151242..a73e5970 100644
--- a/php/class-customize-snapshot-manager.php
+++ b/php/class-customize-snapshot-manager.php
@@ -1125,6 +1125,11 @@ public function handle_update_snapshot_request() {
 			) );
 		}
 
+		/**
+		 * Add any additional checks before saving snapshot.
+		 */
+		do_action( 'customize_snapshot_save_before', $this->snapshot, $this->customize_manager );
+
 		// Set the snapshot UUID.
 		$post_type = get_post_type_object( Post_Type::SLUG );
 		$authorized = ( $post ?
@@ -1181,6 +1186,8 @@ function( $value ) {
 			wp_send_json_error( $data );
 		}
 
+		/** This filter is documented in wp-includes/class-wp-customize-manager.php */
+		$data = apply_filters( 'customize_save_response', $data, $this );
 		wp_send_json_success( $data );
 	}