The active exploitation of a zero-day vulnerability in Microsoft SharePoint has led to a sweeping cyberattack involving over 100 organizations, including the U.S. National Nuclear Security Administration.

Microsoft Corp. advirtió que piratas informáticos están atacando activamente a los clientes de su software de gestión de documentos SharePoint, y los investigadores de seguridad han señalado el riesgo de que se produzcan violaciones de seguridad a gran escala en todo el mundo.

U.S. National Nuclear Security Administration was among those breached by a hack of Microsoft's SharePoint document management software, Bloomberg News reported on Tuesday, citing a person with knowledge of the matter.

Hours after Microsoft revealed hacking groups affiliated with the Chinese government have been exploiting a flaw in its SharePoint software, Bloomberg News reports that the National Nuclear Security Administration has also been breached in the attacks.

A global attack on Microsoft server software used by thousands of government agencies and businesses to share documents within organisations is likely the work of a single actor, a cybersecurity researcher said on Monday.

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,