Language: PHP
Label: vulnerable
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
	public function esi_template( $template ) {
		// Check if is an ESI request
		if ( defined( 'LSCACHE_IS_ESI' ) ) {
			Debug2::debug( '[ESI] calling template' );

			return LSCWP_DIR . 'tpl/esi.tpl.php';
		}
		$this->_register_not_esi_actions();
		return $template;
	}