On which CMS is it easiest to attach OpenID authorization / work with the database (steam web api)?

Question

CMS

For a week now I have been faced with the choice of a free CMS for working with the steam web api.
Authorization by OpenID, recording all data in the database.
The ability to completely replace the CMS authorization system with OpenID authorization is needed.

Answer 1

Well, it seems to me that you can find a plugin for almost any more or less popular CMS
wordpress.org/plugins/openid - here is wordpress
But I have a question - it’s not easier for your goal to write a system on some thread framework, there will be functionality very specific to CMS or I think?