US Nuclear Weapons Agency Breached in Microsoft SharePoint Hack

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3 min read
US Nuclear Weapons Agency Breached in Microsoft SharePoint Hack

US Nuclear Weapons Agency Breached in Microsoft SharePoint Hack

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The U.S. National Nuclear Security Administration (NNSA), responsible for maintaining and designing the nation’s nuclear weapons, was among several entities breached in a hack targeting Microsoft’s SharePoint document management software. The attack, reported on July 22, 2025, exploited a zero-day vulnerability in on-premises SharePoint servers, affecting over 50 organizations globally, including U.S. federal and state agencies, universities, and energy companies. No sensitive or classified information is believed to have been compromised in the NNSA breach, according to an unnamed source familiar with the matter. Details of the Hack The breach, attributed in part to Chinese state-sponsored groups Linen Typhoon, Violet Typhoon, and Storm-2603, began on July 18, 2025, exploiting flaws first identified at a May 2025 hacking competition in Berlin....

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