01:20 PM EDT, 07/23/2025 (MT Newswires) -- (Updates with US Department of Energy response in the fifth paragraph.)

Microsoft ( MSFT ) SharePoint software flaws were exploited by hackers to breach systems at the US National Nuclear Security Administration, Bloomberg reported Wednesday, citing a person familiar with the matter.

The breach at the nuclear agency did not involve sensitive or classified data, according to the report.

Microsoft ( MSFT ) warned that Chinese state-sponsored groups were behind the recent attacks.

"Microsoft ( MSFT ) has observed two named Chinese nation-state actors, Linen Typhoon and Violet Typhoon exploiting these vulnerabilities targeting internet-facing SharePoint servers. In addition, we have observed another China-based threat actor, tracked as Storm-2603, exploiting these vulnerabilities. Investigations into other actors also using these exploits are still ongoing," the company said in a blog post.

A Department of Energy spokesperson told MT Newswires that a "very small number" of systems were impacted from the breach and that all impacted systems are being restored.

Microsoft ( MSFT ) did not immediately respond to MT Newswires' request for comment.

(Market Chatter news is derived from conversations with market professionals globally. This information is believed to be from reliable sources but may include rumor and speculation. Accuracy is not guaranteed.)

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