https://wccftech.com/internet-explorer-silent-threat-to-windows-user/

Microsoft’s Internet Explorer isn’t known for its security features, but things get worse when it can expose Windows users who aren’t even using the browser to threats. Through a proof of concept video and code, security researcher John Page has warned that IE has a critical security vulnerability that allows malicious hackers to get access to your files and steal your data using specially crafted MHT files.

While the browser may be archaic, it’s still present on billions of devices. According to Page, the problem is with the browser’s handling of MHT files and since Windows opens these files using IE by default, even users who don’t run the browser explicitly will be at risk of exposure. All a user has to do is to open an attachment sent through an email to expose themselves to this vulnerability.