Hackers exploited a zero-day vulnerability in Microsoft SharePoint servers, targeting US federal agencies and other entities.

Will Microsoft dock Satya Nadella’s pay again this year? The software giant faced the latest in a seemingly endless string of security breaches over the weekend, when it told customers that hackers were exploiting a flaw in its SharePoint file-sharing software.

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

Microsoft warned users that hackers used a security flaw in its server software to attack government agencies and businesses around the world. The federal government, along with those in Canada and Australia, has launched an investigation into the hack that targeted SharePoint servers, The Washington Post reported.

Microsoft said in a post on its website on Saturday that it was “aware of active attacks targeting on-premises SharePoint Server customers by exploiting vulnerabilities.” SharePoint is a Microsoft platform that allows customers to manage and share documents within their organizations.

Unknown attackers exploited a “significant vulnerability” in Microsoft’s SharePoint collaboration software, hitting targets around the world.

The Matanbuchus malware loader has been seen being distributed through social engineering over Microsoft Teams calls impersonating IT helpdesk.