The company has been called out repeatedly for inadequate security practices, and now we have another case in point: a successful SharePoint hack that’s among the worst in Microsoft’s history.

The incident follows reports that a recent Microsoft security patch failed to fully address a serious flaw in SharePoint server software

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.