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.

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

Sky News Business Editor Ross Greenwood says an urgent warning has been issued to Australian companies and organisations that use Microsoft's content management platform SharePoint. The Australian Cyber Security Centre is urging organisations to "act now" after Microsoft observed active attacks targeting on-premises SharePoint Server customers.

A critical security vulnerability in Microsoft SharePoint has been actively exploited by threat actors to infiltrate thousands of organizations worldwide.

A major cyberespionage operation targeting Microsoft's SharePoint server software has compromised about 100 organizations worldwide. The operation exploits a zero-day vulnerability, allowing hackers to install backdoors on affected servers.