The WP01 plugin for WordPress is vulnerable to Arbitrary File Download in all versions up to, and including, 2.6.2 due to a missing capability check and insufficient restrictions on the make_archive() function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to download and read the contents of arbitrary files on the server, which can contain sensitive information.
https://wordpress.org/plugins/wp01/
https://plugins.trac.wordpress.org/browser/wp01/trunk/inc/class-wp01.php#L109