Comment by fryguy

It seems to me to be the exact opposite of this. If all of the data going from server to client comes through JSON to javascript, which usually means a JSON serializer and should correctly escape the data since you're not generating the JSON by hand, then there is no chance for traditional XSS attacks since the only remaining vector would be doing manual DOM building by concatenating strings, which you generally don't do in React. Now CSRF attacks I would believe you, but not XSS with React.