I would like to know if there is any "advertising platform" cms arround, in order to host affiliate marketing tags / banners / etc
Webmasters Stack Exchange is a question and answer site for webmasters. It only takes a minute to sign up.Sign up to join this community
Open-source "ad server solution" Open X is incredibly powerful, but might have a bit too much of a learning curve if all you're looking to do is affiliate banners.
As an out-of-the-box suggestion, Kajabi is a hosted service. I haven't used it, but it looks like it could be worth a look if it fits your product and business model. Otherwise, you could use a CMS like Joomla or Wordpress and integrate with an affiliate service. Zferral and HasOffers are two such affiliate services you could use. Personally, I recommend the second method.