Provide references for CVE-2021-39340.
Where can I find more information about CVE-2021-39340?
References are available at: https://github.com/BigTiger2020/word-press/blob/main/Notification.md, https://wordfence.com/vulnerability-advisories/#CVE-2021-39340, https://plugins.trac.wordpress.org/browser/notification/tags/7.2.4/src/classes/Utils/Settings.php#L167.