In PHP Proxy 3.0.3, any user can read files from the server without authentication due to an index.php?q=file:/// LFI URI, a different vulnerability than CVE-2018-19246.

PHP-Proxy 5.1.0 allows remote attackers to read local files if the default "pre-installed version" (intended for users who lack shell access to their web server) is used. This occurs because the aeb067ca0aa9a3193dce3a7264c90187 app_key value from the default config.php is in place, and this value can be easily used to calculate the authorization data needed for local file inclusion.