shell bypass 403
<?php if ( ! defined( 'W3TC' ) ) {
die();} ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" <?php do_action( 'admin_xml_ns' ); ?> <?php language_attributes(); ?>>
<head>
<link rel="stylesheet" type="text/css" href="<?php echo esc_url( plugins_url( 'pub/css/error.css?ver=' . W3TC_VERSION, W3TC_FILE ) ); ?>" />
<title>Error</title>
<meta http-equiv="Content-Type" content="<?php bloginfo( 'html_type' ); ?>; charset=<?php echo esc_attr( get_option( 'blog_charset' ) ); ?>" />
</head>
<body>
<p>
<?php echo esc_html( $error ); ?>
</p>
</body>
</html>