The unCaptcha automated system can once again bypass Googles reCAPTCHA challenges, despite major updates to the security service. UnCaptcha has been modified and it is able to bypass Google reCaptcha again. Google experts introduced a couple features to improve Google’s security to bypass the system. They enhanced the browser automation detection and used spoken phrases instead of spoken digits. The code now only needs to make a single request to a free, publicly available speech to text API to achieve 90% accuracy over all captchas.”]
Source: https://securityaffairs.co/wordpress/79435/hacking/uncaptcha-bypasses-recaptcha.html