Provide references for CVE-2021-4337.
Where can I find more information about CVE-2021-4337?
References are available at: https://www.wordfence.com/threat-intel/vulnerabilities/id/05481984-7c18-4ec7-8d7c-831809c3e86b?source=cve, https://blog.nintechnet.com/16-woocommerce-product-add-ons-plugins-fixed-vulnerabilities/, https://xforwoocommerce.com/blog/change-log/xforwoocommerce-1-7-0/.