Admin Word Count Column <= 2.2 - Unauthenticated Arbitrary File Read

The plugin does not validate the path parameter given to readfile(), which could allow unauthenticated attackers to read arbitrary files on server running old version of PHP susceptible to the null byte technique. This could also lead to RCE by using a Phar Deserialization technique

https://example.com/wp-content/plugins/admin-word-count-column/download-csv.php?path=/etc/passwd\0