https://build.prestashop.com/news/major-security-vulnerability-on-prestashop-websites/

todo

Delete from config/smarty.config.inc.php

if (Configuration::get('PS_SMARTY_CACHING_TYPE') == 'mysql') {
    include _PS_CLASS_DIR_.'Smarty/SmartyCacheResourceMysql.php';
    $smarty->caching_type = 'mysql';
}