The Clipboard (AKA: Pasteboard) has been in the macOS from before the fall of the Roman Empire. We all use it everyday without thinking about it. I must confess, I have never considered any kind of security aspect of the macOS Clipboard, perhaps I should have. This article describes a recent security update to the macOS Clipboard API and WebKit which is what Safari is based on. It looks like a real plus if you are prone to pasting stuff from websites onto your Mac Clipboard.