https://twitter.com/myetherwallet/status/988787116015415296
Source:
Make sure to download the Chrome extension: https://chrome.google.com/webstore/detail/myetherwallet/nlbmnnijcnlegkjjpcfjclmcfggfefdm
And more importantly, get a Trezor to be completely secure.
Be careful for now and do not use MEW Web until further notice.