Provide references for CVE-2021-4340.
Where can I find more information about CVE-2021-4340?
References are available at: https://www.wordfence.com/threat-intel/vulnerabilities/id/10b7a88f-ce46-42aa-ab5a-81f38288a659?source=cve, https://blog.nintechnet.com/wordpress-ulisting-plugin-fixed-multiple-critical-vulnerabilities/.