Description
WordPress Plugin File Manager is prone to a cross-site request forgery vulnerability. Exploiting this issue may allow a remote attacker to perform certain administrative actions and gain unauthorized access to the affected application; other attacks are also possible. WordPress Plugin File Manager version 3.0.1 is vulnerable; prior versions may also be affected.
Remediation
Edit the source code to ensure that CSRF protection is implemented with Nonce-like mechanism or disable the plugin until a fix is available
References
https://sumofpwn.nl/advisory/2016/cross_site_request_forgery_in_file_manager_wordpress_plugin.html
http://www.openwall.com/lists/oss-security/2017/03/01/4