Provide references for CVE-2021-38359.
Where can I find more information about CVE-2021-38359?
References are available at: https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38359, https://plugins.trac.wordpress.org/browser/refer-a-friend-widget-for-wp/tags/1.4.1/admin/admin.php#L75.