Panasonic group company says a project member uploaded HR data on about 334,000 employees, former staff and relatives to a banned generative AI service
Panasonic Operational Excellence, a Panasonic Holdings subsidiary, announced on 23 October 2026 that a member of an in-house project introducing a personnel information system had uploaded part of that system's data, as registered in April 2026, to an external generative AI service whose use the company prohibits. According to the announcement as reported by ITmedia and CNET Japan, the data covered about 75,000 current and about 178,000 former employees of Panasonic group companies in Japan (employee numbers, addresses, phone numbers and email addresses, without names) and about 81,000 family members registered as emergency contacts (names, addresses, phone numbers and email addresses), about 334,000 people in all. The company says the upload broke internal rules and was not an outside attack, that the employee deleted the chat history and the local data immediately after the problem came to light, and that it reported the matter to Japan's Personal Information Protection Commission on 29 September. The provider told the company that training on the data was switched off at upload but that deleted data is kept for 30 days, until 25 October. No public exposure or misuse had been confirmed. The company has not named the AI service.
AI involvement reported · Causal attribution supported · 3 sources, 1 underlying account · Added 24/10/2026