A global cyberattack is unfolding as hackers exploit a critical zero-day vulnerability in Microsoft's SharePoint software, threatening tens of thousands of on-premises servers used by

Microsoft is issuing an emergency fix to close off a vulnerability in Microsoft’s SharePoint software that hackers have exploited to carry out widespread attacks on businesses and at least some federal agencies.

LONDON >> A security patch released by Microsoft earlier this month failed to fully fix a critical flaw in the U.S. tech company’s SharePoint server software that had been identified at a hacking competition in May,