MyPixs <= 0.3 - Unauthenticated Local File Inclusion (LFI)

Description

Plugin is still affected and has been closed.

Typical local file inclusion vulnerability:

from downloadpage.php:
<?php
$url = $_REQUEST["url"];
if ($url != "") {
include($url);
}
?>

I've tried to get RCE but didn't have success reading from /proc/self/environ or /var/log/apache2/access.log

include(): Failed opening '/proc/self/environ' for inclusion (include_path='.:/usr/share/php:/usr/share/pear') in /usr/share/wordpress/wp-content/plugins/mypixs/mypixs/downloadpage.php on line 4