CVE-2016-5201
A leak of privateClass in the extensions API in Google Chrome prior to 54.0.2840.100 for Linux, and 54.0.2840.99 for Windows, and 54.0.2840.98 for Mac allowed a remote attacker to access privileged JavaScript code via a crafted HTML page.
Date published : 2017-01-19
http://www.securityfocus.com/bid/94196
https://chromereleases.googleblog.com/2016/11/stable-channel-update-for-desktop_9.html