Check which version of Google Chrome you are using. Versions earlier than 72.0.3626.121 are at risk.

If you are on a laptop or desktop computer, open Chrome and visit chrome://settings/help. If you are not up-to-date, visiting the page should automatically update your browser.

If you are on a mobile device, like a mobile phone or tablet, open Chrome and visit chrome://version. If you are not up-to-date, visit your app store and download the update.

Other web browsers are not at risk.