The Migration, Backup, Staging WordPress plugin before 0.9.76 does not sanitise and validate a parameter before using it to read the content of a file, allowing high privilege users to read any file from the web server via a Traversal attack
https://wpscan.com/vulnerability/cb6a3304-2166-47a0-a011-4dcacaa133e5
http://seclists.org/fulldisclosure/2022/Oct/0
http://packetstormsecurity.com/files/168616/WordPress-WPvivid-Backup-Path-Traversal.html