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US nuclear weapons agency breached in Microsoft SharePoint hack, Bloomberg News reports

UNITED STATES, JUL 23 – Chinese state-sponsored hackers exploited a zero-day SharePoint vulnerability to breach over 50 organizations including the nuclear agency, with no classified data compromised, officials said.

  • The Department of Energy reported that on Friday, July 18th, hackers exploited a Microsoft SharePoint zero-day, with the National Nuclear Security Administration among those breached, an agency spokesman said.
  • Microsoft in a blog post Tuesday noted that flaws exploited since at least Jul 7 were used by Chinese state-backed groups Linen Typhoon and Violet Typhoon, exploiting SharePoint vulnerabilities.
  • Bloomberg reported systems belonging to the U.S. Education Department, Florida's Department of Revenue and the Rhode Island General Assembly were compromised, with limited impact due to reliance on Microsoft 365 cloud, Bloomberg said.
  • Bloomberg reports that all impacted systems are being restored following breaches, and full damage remains unclear.
  • SharePoint Online, Microsoft said, will likely face continued exploitation despite patches, while the company emphasized the resilience of its cloud services.
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De Telegraaf broke the news in Amsterdam, Netherlands on Tuesday, July 22, 2025.
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