fixed maintenance mode page not working with new CSRF implementation, #2424

src/middleware/middleware.js

@@ -465,12 +465,14 @@ middleware.maintenanceMode = function(req, res, next) {
 			res.status(503);
 
 			if (!isApiRoute.test(req.url)) {
+				middleware.applyCSRF(req, res, function() {
 					middleware.buildHeader(req, res, function() {
 						res.render('maintenance', {
 							site_title: meta.config.title || 'NodeBB',
 							message: meta.config.maintenanceModeMessage
 						});
 					});
+				});
 			} else {
 				translator.translate('[[pages:maintenance.text, ' + meta.config.title + ']]', meta.config.defaultLang || 'en_GB', function(translated) {
 					res.json({