Description
WordPress Plugin Backup by Supsystic is prone to a local file inclusion vulnerability because it fails to sufficiently verify user-supplied input. Exploiting this issue may allow an attacker to obtain sensitive information that could aid in further attacks. WordPress Plugin Backup by Supsystic version 2.3.9 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 2.3.12 or latest
References
https://www.exploit-db.com/exploits/49545
https://plugins.svn.wordpress.org/backup-by-supsystic/trunk/readme.txt