Provide references for CVE-2021-4443.
Where can I find more information about CVE-2021-4443?
References are available at: https://www.wordfence.com/threat-intel/vulnerabilities/id/04003542-fd62-4587-9834-70e7fe8f08ef?source=cve, https://sh3llcon.org/la-debilidad-de-wordpress/, https://www.acunetix.com/vulnerabilities/web/wordpress-plugin-wordpress-mega-menu-quadmenu-remote-code-execution-2-0-6/.