The DoLeads Integrator WordPress plugin through 0.65, wp2epub WordPress plugin through 0.65 have been seen to be used to achieve RCE, once they are added adding to a blog, for example using a vulnerability where unclosed extensions from wordpress.org can be installed by unauthorized users.
https://wpscan.com/vulnerability/dd043e6c-e6c6-4c8d-aab0-5265d28f5cf6/