Nuclear Weapons Agency Breached in Microsoft SharePoint Hack

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

No sensitive or classified information is known to have been compromised in the attack on the National Nuclear Security Administration, said the person, who wasn’t authorized to speak publicly and asked not to be identified. The semiautonomous arm of the Energy Department is responsible for producing and dismantling nuclear arms. Other parts of the department were also compromised.