US government security incident history
Hacking, data breaches and other security incidents involving US government, with related coverage.
US government announces it was hacked
The US government said it had been hacked. The breach came to light on 2 July.
Read on TechCrunch ↗War plans leaked from US national security team's Signal chat
Impact: Leak of national security team conversations and war plans
War plans were leaked from a chat app conversation of the Trump administration's national security team. Security concerns were raised over sharing plans via Signal, and Leon Panetta said an investigation was needed. It was also reported that, following the leak, the US Department of Defense had warned that Signal was a target for hackers.
Related reports: 4 · last report →Trump and DOGE sued over access to federal personal data
Allegations of a federal data breach arose over Elon Musk and the Department of Government Efficiency's access to Americans' personal information. On 10 February 2025, a privacy non-profit and the International Association of Machinists and Aerospace Workers, among others, filed a lawsuit against Trump, the Department of Government Efficiency and others.
Related reports: 2 →US government allegedly loses $20 million in crypto to hack
Impact: Alleged loss of about $20 million in Ethereum and USDC
Allegations emerged that the US government lost about $20 million in Ethereum and USDC to a hack. The date of the incident and the response have not been confirmed.
Read on Binance ↗Microsoft security failings raised over Russian hack of US government
A whistleblower raised claims about Microsoft's security response in connection with a Russian hack targeting the US government. The whistleblower claimed Microsoft put profit ahead of security, leaving the US government vulnerable to Russian hacking.
Read on ProPublica ↗