As discussed in the more detail in the post for the other vulnerability we found in the WP Editor plugin, we recently started seeing requests for a file in this plugin on one of our websites and we believe that it was checking for use of the plugin before exploiting it. After seeing that we started checking for vulnerabilities.
In addition the vulnerability we discussed in the other we post, we also found that any logged in user can edit files on the website since there is no check as to the user capabilities when editing the files. The protection against cross-site request forgery (CSRF) is broken, so it is also susceptible to that. [Read more]