The researcher East-Ee Security devised a proof of concept bypass of the Googles reCaptcha V2 verification system dubbed ReBreakCaptcha. The PoC uses the Google web-based tools for its purpose. It leverages Google APIs to capture audio challenges as sound files and send them to Google Speech Recognition API. The technique uses a way to get an audio challenge as part of the ReCaptcha process and bypassing the system by sending the results in text format.”]
Source: http://securityaffairs.co/wordpress/56816/hacking/rebreakcaptcha-google-recaptcha-hacking.html