What CMS would be best to use to "auto generate" a website?

We've developed a SaaS that allows users to upload content from a dashboard and then make it available in an iOS and Android app.

We would like to extend that to websites to make it easy to get a website up and running.

Now, putting aside any sort of template/CSS etc, what would the best option be for this?

Perhaps creating scripts that installs Wordpress with and developing custom plugins to get content from our SaaS?

We don't want to create our own CMS, since there are so many out there with much better support and security updates etc, which is why I am leaning towards Wordpress.