The acting head of the US government's top cybersecurity agency, Madhu Gottumukkala, reportedly uploaded sensitive government files into a public version of ChatGPT, triggering internal security alerts and a federal review. The files were marked 'For Official Use Only' and were uploaded last summer. Gottumukkala had been granted permission to use ChatGPT with certain controls in place. The incident has raised concerns about the potential exposure of sensitive data.