The UNIXY cPanel plugin is a web interface to manage Varnish via cPanel/WHM. UNIXY Varnish (cPanel Plugin) had a vulnerability which caould allow a malicious user to read any file on the server regardless of the ownership.

This vulnerability was patched in UNIXY cPanel Varnish v1.8.6. It is advisable to upgrade it as soon as possible if you are using older version.