Microsoft has issued an alert about “active attacks” on server software used by government agencies and businesses to share documents within organizations, and recommended security updates that customers should apply immediately.

Microsoft warned of "active attacks" targeting some users of its SharePoint software over the weekend and released an emergency patch that fixes only some versions of the vulnerable server software. Why it matters: It remains unclear how many businesses were already hacked prior to Microsoft's warning,

A warning has been issued to Microsoft users detailing a cybersecurity flaw that allowed hackers to access its SharePoint servers, the U.S. Cybersecurity and Infrastructure Security Agency (CISA) announced.