Microsoft released a new KB article warning users of a new vulnerability in Internet Explorer. This affects most people if they are using Windows XP or newer. As it's been a couple weeks since XP was dropped from support, it will not be receiving a patch when this is resolved. So, XP users – either upgrade your OS or move to Chrome/Firefox/Opera or your other alternative browser of choice.
The vulnerability is a remote code execution vulnerability. The vulnerability exists in the way that Internet Explorer accesses an object in memory that has been deleted or has not been properly allocated. The vulnerability may corrupt memory in a way that could allow an attacker to execute arbitrary code in the context of the current user within Internet Explorer. An attacker could host a specially crafted website that is designed to exploit this vulnerability through Internet Explorer and then convince a user to view the website.