Crediar confirmed today that the browser exploit that we have yet to really see anything about has been crushed by Nintendo with todays 5.0.0 update:
Do not update this update seems to fix a certain exploit in the browser.
In a quick update Marionumber1 has now stated:
People need to calm the hell down. Nintendo did not block the bug in the browser, they simply changes around some addresses. The exploit has not been blocked, I doubt Nintendo even knows one exists. You know what might cause them to know, however? This mass hysteria.