diff --git a/phpBB/phpbb/install/helper/iohandler/ajax_iohandler.php b/phpBB/phpbb/install/helper/iohandler/ajax_iohandler.php
index c168d26425..591a19b7c1 100644
--- a/phpBB/phpbb/install/helper/iohandler/ajax_iohandler.php
+++ b/phpBB/phpbb/install/helper/iohandler/ajax_iohandler.php
@@ -120,6 +120,22 @@ class ajax_iohandler extends iohandler_base
 		return $this->request->variable($name, $default, $multibyte);
 	}
 
+	/**
+	 * Returns untrimmed input variable
+	 *
+	 * @param string	$name		Name of the input variable to obtain
+	 * @param mixed		$default	A default value that is returned if the variable was not set.
+	 * 								This function will always return a value of the same type as the default.
+	 * @param bool		$multibyte	If $default is a string this paramater has to be true if the variable may contain any UTF-8 characters
+	 *								Default is false, causing all bytes outside the ASCII range (0-127) to be replaced with question marks
+	 *
+	 * @return mixed	Value of the untrimmed input variable
+	 */
+	public function get_untrimmed_input($name, $default, $multibyte = false)
+	{
+		return $this->request->untrimmed_variable($name, $default, $multibyte);
+	}
+
 	/**
 	 * {@inheritdoc}
 	 */
diff --git a/phpBB/phpbb/install/module/obtain_data/task/obtain_database_data.php b/phpBB/phpbb/install/module/obtain_data/task/obtain_database_data.php
index ce720dbf76..9019cf4332 100644
--- a/phpBB/phpbb/install/module/obtain_data/task/obtain_database_data.php
+++ b/phpBB/phpbb/install/module/obtain_data/task/obtain_database_data.php
@@ -79,10 +79,19 @@ class obtain_database_data extends \phpbb\install\task_base implements \phpbb\in
 		$dbhost			= $this->io_handler->get_input('dbhost', '', true);
 		$dbport			= $this->io_handler->get_input('dbport', '');
 		$dbuser			= $this->io_handler->get_input('dbuser', '');
-		$dbpasswd		= $this->io_handler->get_input('dbpasswd', '', true);
 		$dbname			= $this->io_handler->get_input('dbname', '');
 		$table_prefix	= $this->io_handler->get_input('table_prefix', '');
 
+		// Need to get untrimmed password when using ajax IO handler
+		if ($this->io_handler instanceof \phpbb\install\helper\iohandler\ajax_iohandler)
+		{
+			$dbpasswd		= htmlspecialchars_decode(htmlspecialchars_decode($this->io_handler->get_untrimmed_input('dbpasswd', '', true)));
+		}
+		else
+		{
+			$dbpasswd		= $this->io_handler->get_input('dbpasswd', '', true);
+		}
+
 		// Check database data
 		$user_data_vaild = $this->check_database_data($dbms, $dbhost, $dbport, $dbuser, $dbpasswd, $dbname, $table_prefix);