On Oct. 31, Google’s Threat Analysis Group revealed a vulnerability in most versions of Windows that is actively being exploited by malware attacks.

Today, Terry Myerson, executive vice president of Microsoft’s Windows and Devices group, acknowledged the exploit was being used actively by a sophisticated threat group—the same threat group involved in the hacks that led to the breach of data from the Democratic National Committee and the Clinton campaign. And while a patch is on the way for the vulnerability, he encouraged customers to upgrade to Windows 10 for protection from further advanced threats.

Myerson wrote: