https://techcrunch.com/2019/09/24/microsoft-emergency-patch-windows/

Microsoft has warned Windows users to install an “emergency” out-of-band security patch.

The software giant said in an advisory that a security flaw in some versions of Internet Explorer could allow an attacker to remotely run malicious code on an affected device. A user could be stealthily infected by visiting a malicious web page or by being tricked into clicking on a link in an email.