From e48bda29143bd1a83001780b4a78e483822d985c Mon Sep 17 00:00:00 2001
From: omer citak <mail@omercitak.com>
Date: Thu, 19 Jul 2018 01:20:51 +0300
Subject: [PATCH] fix XSS vulnerability

details: https://github.com/symfony/symfony/issues/27987
---
 ExceptionHandler.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ExceptionHandler.php b/ExceptionHandler.php
index 8fedc1b..101f3f4 100644
--- a/ExceptionHandler.php
+++ b/ExceptionHandler.php
@@ -398,7 +398,7 @@ private function formatArgs(array $args)
                 $formattedValue = str_replace("\n", '', var_export($this->escapeHtml((string) $item[1]), true));
             }
 
-            $result[] = is_int($key) ? $formattedValue : sprintf("'%s' => %s", $key, $formattedValue);
+            $result[] = is_int($key) ? $formattedValue : sprintf("'%s' => %s", $this->escapeHtml($key), $formattedValue);
         }
 
         return implode(', ', $result);