The newly discovered flaw in Microsoft's SharePoint software has allowed hackers to target dozens of companies and organizations. Only a partial fix has been issued.

The hackers behind the initial wave of attacks exploiting a zero-day in Microsoft SharePoint servers have so far primarily targeted government organizations, according to researchers as well as news reports.

Microsoft Corp. warned that hackers are actively targeting customers of its document management software SharePoint, with security researchers flagging the risk of potentially widespread breaches around the world.