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Incidents on Oct 2, 2026

Publication date: Dates are source publication dates (JST), not occurrence dates.

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Incidents on Oct 2, 2026
DateTargetSummaryClassificationSource links
LEAK-104Dai-ichi Life Group / Dai-ichi Life InsuranceA About 120,000 peopleOn September 24, 2026, the two companies detected unauthorized access to their employee HR system and announced that personal information of about 120,000 current and former employees may have been viewed and leaked. No unauthorized access to customer information was confirmed.
Unauthorized access & data leakPossibleOfficial statement
LEAK-141Japan Organization for Metals and Energy Security (JOGMEC)C About 8,500 recordsOn September 9, 2026, it came to light that personal information may have leaked through unauthorized external access to JOGMEC's information system. About 1,100 email addresses of JOGMEC staff and about 7,400 non-JOGMEC email addresses are affected. No public disclosure or misuse of the data has been confirmed.
Unauthorized access & data leakPossibleOfficial statement
LEAK-085The Institute of Energy Economics, JapanD 759 recordsA detailed investigation into the unauthorized access to the Microsoft 365 accounts of six staff members confirmed the leak of 13 items of passport information and found that 759 email addresses and other data may have been leaked. No public disclosure to an unspecified audience or misuse has been confirmed.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-142Nichii GakkanD 583 peopleA backup file containing information submitted through the inquiry form on the company's nursing care website remained on the web server because of flaws in the contractor's file management and deletion procedures after backup work, and it could be downloaded from outside without authentication from May 11, 2020 to September 11, 2026. Of 2,674 inquiries from November 2015 to May 2020, 583 people's entries contained personal information, and 99 of them included sensitive personal information about health conditions or disabilities. Retained logs from June 11, 2026 onward show no third-party access, but earlier access cannot be verified, so the company treats it as a possible leak.
Misdelivery & accidental exposurePossibleOfficial statement
LEAK-084Yamato Transport "Kuroneko Daikin Atobarai Service"The "Kuroneko Daikin Atobarai Service" was accessed without authorization by a third party on September 28, and the investigation found that names, addresses, phone numbers, billing amounts and other data of some users, information on some partner merchants, and names of staff in charge may have been leaked. Card information and passwords are not included.
Unauthorized access & data leakPossibleOfficial statement
LEAK-105The Japan TimesThe company announced that part of a server managed by a group company was accessed without authorization. Whether information leaked, the scope of impact and the cause are under investigation with external specialists, and no impact has been confirmed on its digital edition, subscriber databases or payment system.
Unauthorized access & data leakUnder investigationOfficial statement
LEAK-107MoonstarThe company announced that an external intrusion into its system server may have led to the viewing or acquisition of online store customers' names, addresses, phone numbers, email addresses and past order information. No number of affected records was given.
Unauthorized access & data leakPossibleOfficial statement
LEAK-108Kodansha BECKAn employee's email account formerly used at Kodansha BC was accessed without authorization, and 50 suspicious emails were sent externally on September 14, 2026. Traces show mail data was obtained, so personal information stored in the account may have leaked.
Unauthorized access & data leakPossibleOfficial statement
LEAK-110Sammy Networks "777CON-PASS"The server of the 777CON-PASS app it operates was accessed without authorization, and user data was targeted on September 25, 2026. Gender, date of birth, profile photos, action areas and other data may have leaked. The number of affected users is under investigation.
Unauthorized access & data leakPossibleOfficial statement
Incidents on Oct 2, 2026