Nintendo has released Nintendo 3DS firmware version 9.5.0-23. This patch fixes the web browser exploit that was being used to inject Pokémon into XY and ORAS as well as unlocking free items in Pokémon Shuffle. Users will need to update to the latest version to use the Nintendo eShop.

Main changes for version 9.5.0-23U:

Update released: March 2nd, 2015 - Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

Source: http://en-americas-support.nintendo.com/app/answers/detail/a_id/231/~/system-menu-update-history