A quiet Microsoft vulnerability in a popular collaboration platform opened the door to a much bigger cybersecurity threat.

Microsoft has warned that Chinese state-sponsored hackers have breached its SharePoint software used by the US agency responsible for maintaining and modernizing the nation’s stockpile of nuclear weapons, according to a report.

In ongoing hacks, Microsoft says it has identified two Chinese hacking groups taking advantage of a key software flaw.

The Chinese government has warned against using cyber security issues to defame the country, following the hacker attacks on Microsoft software. Foreign Ministry spokesman Guo Jiakun said in Beijing on Wednesday that he was not aware of the exact circumstances of the attacks.

Jade Wilson, a software engineer at Microsoft, received later-in-life autism and ADHD diagnoses. Big Tech networking events can pose a challenge.