Insufficient enforcement of file access permission in the activeTab case in Extensions in Google Chrome prior to 68.0.3440.75 allowed an attacker who convinced a user to install a malicious extension to access files on the local file system via a crafted Chrome Extension.
https://access.redhat.com/errata/RHSA-2018:2282
https://chromereleases.googleblog.com/2018/07/stable-channel-update-for-desktop.html