NEW YORK (AP) — Microsoft has issued 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.

Microsoft SharePoint servers were targeted in a major cyberattack that cybersecurity experts say could impact over 10,000 companies worldwide, according to a report by Bloomberg. The breach exploited a vulnerability that allowed hackers to access file systems and execute code,