The US agency responsible for maintaining and designing the nation’s cache of nuclear weapons was breached by a hack of Microsoft Corp.’s SharePoint document management software, according to a perso...

Microsoft has patched two critical zero-day SharePoint security flaws that have already been exploited by hackers to attack vulnerable organizations.

The disclosure marks a potential escalation in the campaign, which has already hit at least 400 victims, according to Netherlands-based cybersecurity firm Eye Security.