Description
WordPress Plugin File Manager is prone to an information disclosure vulnerability. Attackers can exploit this issue to obtain sensitive information that may help in launching further attacks. WordPress Plugin File Manager version 6.4 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 6.5 or latest
References
https://zeroaptitude.com/zerodetail/wordpress-plugin-bug-hunting-part-1/
https://plugins.svn.wordpress.org/wp-file-manager/trunk/readme.txt