When setting user/password for Basic Authentication, the component misses adding the HTTP headers to perform the actual authentication.
Users should see the following message in logs, even though the user/pass properties are set:
2018-06-27 17:20:16 [main] WARN o.a.c.c.w.p.WordpressPostProducer - Wordpress Producer hasn't authentication. This may lead to errors during route execution. Wordpress writing operations need authentication.