LocalTapiola: Persistent XSS at verkkopalvelu.tapiola.fi using spoofed React element and React v.0.13.3

Hi, Background I noticed that the app at: https://verkkopalvelu.tapiola.fi/e2/autovakuutus/vakuutuslaskuri/ was running an old version of React. In this version 0.13.3 there's an issue, initially discovered by @danlec actually on HackerOne: http://danlec.com/blog/xss-via-a-spoofed-react-element T...