Incorrect handling of CORS in ServiceWorker in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to leak cross-origin data via a crafted HTML page.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2018-17913
https://chromereleases.googleblog.com/2018/04/stable-channel-update-for-desktop.html