Description
WordPress Plugin Media File Manager is prone to multiple vulnerabilities, including cross-site scripting, directory traversal and security bypass vulnerabilities. Exploiting these issues could allow an attacker to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, to steal cookie-based authentication credentials, to obtain sensitive information that could aid in further attacks, or to perform otherwise restricted actions and subsequently move or rename files. WordPress Plugin Media File Manager version 1.4.2 is vulnerable; prior versions may also be affected.
Remediation
Disable the plugin until a fix is available
References
https://www.exploit-db.com/exploits/45809/
https://wordpress.org/plugins/media-file-manager/#description