http://wccftech.com/hackers-commands-siri-alexa/

For just $3, hackers can silently command any voice assistant to open up a malicious website.

Cybercriminals can give potentially harmful instructions to popular voice assistants like Siri, Cortana, Alexa, and Google Assistant. Researchers have revealed that the most popular smart assistants can be manipulated to respond to commands that can’t be heard by their human owners. The attack vector requires just $3 investment enabling criminals to remotely launch attacks.