Researchers discovered security flaw in Google Glass that allowed them to capture data without the user’s knowledge. Lookout Security was able to force Google Glass to silently connect to a Wi-Fi access point. When combined with an Android 4.0.4 web vulnerability, the hack apparently gave researchers full control of the Glass headset. Google filed a bug report with the Glass development team and the issue was fixed by version XE6, released on 4 June, Google said on 16 May. The problem was that Google Glass could be told to execute a QR code without having to give permission.
Source: https://thehackernews.com/2013/07/Hacking-Google-Glass-QR-Code.html