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U.S. nuclear and health agencies hit in Microsoft SharePoint breach

Posted on July 24, 2025 by Dissent

Ellen Nakashima, Joseph Menn and Carolyn Y. Johnson report:

The National Institutes of Health and the federal agency responsible for securing the nation’s nuclear weapons were among the victims in a global breach of Microsoft server software over the weekend, according to officials at the agencies.

The incident at NIH, which has not been previously reported, involved at least one Microsoft SharePoint server system, said Andrew Nixon, a spokesman for the Department of Health and Human Services, and its scope and severity are being investigated.

The compromise at the National Nuclear Security Administration, an arm of the Energy Department, did not affect any classified information, said a person familiar with the matter who, like others, spoke on the condition of anonymity to discuss nonpublic matters.

Read more at The Washington Post.

As first reported by Bloomberg, sources within the agency noted that there was no evidence of sensitive or classified information compromised in the breach.

Category: Government SectorHack

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