From cb593c0e04fc9f3318443fe42b596d27498729c3 Mon Sep 17 00:00:00 2001
From: Mate Bartus <mate.bartus@gmail.com>
Date: Fri, 24 Jul 2015 00:04:40 +0200
Subject: [PATCH] [ticket/13740] Filter basic directory change attempts in lang
 change

PHPBB3-13740
---
 phpBB/phpbb/install/controller/helper.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/phpBB/phpbb/install/controller/helper.php b/phpBB/phpbb/install/controller/helper.php
index f3400e6ef0..8530a0defe 100644
--- a/phpBB/phpbb/install/controller/helper.php
+++ b/phpBB/phpbb/install/controller/helper.php
@@ -191,7 +191,8 @@ class helper
 			$this->language_cookie = $lang;
 		}
 
-		$lang = (!empty($lang)) ? $lang : null;
+		$lang = (!empty($lang) && strpos($lang, '/')) ? $lang : null;
+
 		$this->render_language_select($lang);
 
 		if ($lang !== null)