AFAIK there is no widget for this purpose. But you could easily model this. With a little help op java you could fetch articles with an rss feed which you could map into your model with a xml-to-domain mapping.
Because rss is a really simple format, you could easily model this in a domain model. After fetching the data you can do whatever you like.
In addition to Samet's reply:
Here is an explanation about how to start with implementing any HTTP (such as RSS) based protocol in Mendix.
I have a prototype rss server module available, if you are interested, contact me.