White House says closely tracking Microsoft's emergency patch

FILE PHOTO: Silhouettes of laptop and mobile device users are seen next to a screen projection of Microsoft logo in this picture illustration taken March 28, 2018. REUTERS/Dado Ruvic/Illustration/File Photo

WASHINGTON (Reuters) - The White House is closely tracking an emergency patch Microsoft Corp has released, U.S. national security adviser Jake Sullivan said on Thursday, after an unknown hacking group recently broke into organizations using a flaw in the company's mail server software.

"We are closely tracking Microsoft’s emergency patch for previously unknown vulnerabilities in Exchange Server software and reports of potential compromises of U.S. think tanks and defense industrial base entities," Jake Sullivan, President Joe Biden's national security adviser, said on Twitter.