We’ve confirmed that cybercriminals are currently targeting a limited number of Internet Explorer customers through trusted websites.
If you’re not running a modern version of Internet Explorer, we recommend upgrading immediately to ensure that you receive the benefit of additional security features that can help prevent successful attacks. We also recommend installing the newly released Fix it (an easy, one-click download to help keep your computer protected), which does not require a reboot. Not sure if you are running a modern version of Internet Explorer? Learn how to check your web browser version.
To find tips on how to stay safer online, visit the Microsoft Safety & Security Center.
Addendum: This Fix it was designed for all versions of Internet Explorer. If you have automatic updating turned on, you already received this update as part of our normal updating process on Security Update Tuesday, October 8.