No software is 100% secure and WordPress is no exception. Core developers constantly release updates which take care of discovered security problems and ads overall improvements.
With more than 40,000 plugins available at WordPress.org, it is a biggest free plugin marketplace and storage on the web. The problem is that for an average business person it can be really tricky to discover must have plugins.
If your business requires multiple people to manage your website or you have a blog with multiple authors – you should know how to manage WordPress user roles.