Shopware before 5.3.4 has a PHP Object Instantiation issue via the sort parameter to the loadPreviewAction() method of the Shopware_Controllers_Backend_ProductStream controller, with resultant XXE via instantiation of a SimpleXMLElement object.
https://github.com/advisories/GHSA-6m27-7cqj-2mxw
https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-2819
https://demo.ripstech.com/projects/shopware_5.3.3
https://blog.ripstech.com/2017/shopware-php-object-instantiation-to-blind-xxe/