Google released an updated version of Chrome 66 (version 66.0.3359.170) for Windows, Mac, and Linux systems that addressed 4 security vulnerabilities. Three of the vulnerabilities were reported by external researchers, the most severe issues are a privilege escalation in extensions tracked as CVE-2018-6121 and a type confusion in V8. An anonymous researcher reported that chaining the two flaws could result in the sandbox escape and could allow a remote attacker to take control of target systems.”]
Source: https://securityaffairs.co/wordpress/72400/security/chrome-66-flaws.html