Provide references for CVE-2021-28998.
Where can I find more information about CVE-2021-28998?
References are available at: https://seclists.org/fulldisclosure/2021/Mar/50, https://github.com/beerpwn/CVE/blob/master/cms_made_simple_2021/file_upload_RCE/File_upload_to_RCE.md.