A same origin policy bypass flaw was found in the Service Worker component of the Chromium browser.
Created chromium tracking bugs for this issue:
Affects: fedora-all [bug 1568801]
Affects: epel-7 [bug 1568800]
This issue has been addressed in the following products:
Red Hat Enterprise Linux 6 Supplementary
Via RHSA-2018:1195 https://access.redhat.com/errata/RHSA-2018:1195