Self-Hosted WordPress Websites: A Few SEO Do’s and Don’ts. You could argue that an out-of-the-box, uncustomized WordPress installation is the most search engine-friendly CMS out there– but it is also the scarcest variety, rarely seen in the wild.
And as soon as you install a theme or plugins that generate HTML code, your new hybrid may not play nice with search engines. Luckily, with WordPress it’s pretty easy to do the right thing. SEO Friendly WordPress in 12 Steps. WordPress SEO: The Ultimate Guide.