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Incidents on Oct 29, 2026

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

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Showing 29 of 29 incidents

Incidents on Oct 29, 2026
DateTargetSummaryClassificationSource links
LEAK-738Owari Asahi CityS 4,454,097 recordsOwari Asahi City experienced unauthorized access to the hometown tax portal "Furusato Choice," resulting in the leakage of personal information of registered members. The number of leaked records is 4,454,097 records, including details such as names, email addresses, addresses, phone numbers, hashed passwords, and estimated donation deduction amounts.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-754Kama CityS 4,454,097 recordsKama City announced that personal information of members was leaked from the hometown tax portal "Furusato Choice". The number of leaked records is 4,454,097 records, and the information includes names, email addresses, addresses, phone numbers, hashed passwords, and estimated donation deduction amounts.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-711Net School Inc.C 6,098 recordsNet School Inc. announced that there was unauthorized access to the email distribution service "Blast Mail," resulting in the leakage of the entire registered email recipient list. The leaked email addresses include 6,098 records, along with personal information such as names and birth years.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-843Monex, Inc.C About 1,000 recordsUnauthorized access occurred on the company's website, confirming that personal information was leaked. The leaked information includes approximately 1,000 records.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-786Taito CityE 93 peopleUnauthorized access occurred to the official website operated by the Taito City Great River Drama 'Berabou' Promotion Council, resulting in the confirmed leakage of personal information of 93 people. The leaked information included names, email addresses, addresses, and phone numbers.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-723Nakatosa TownF 5 recordsUnauthorized access occurred at the operator of the website production service related to the "Play Public Relations Project" commissioned by Nakatosa Town, resulting in the leakage of some information managed by the company. The confirmed leaked information includes names, email addresses, and inquiry details for 5 records.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-664BlueskyUnauthorized access to Sagawa Express's "Package Inquiry Service" may have resulted in the leakage of approximately 53,230,000 pieces of personal information.
Unauthorized access & data leakPossibleOfficial statement
LEAK-694All Nippon AirwaysUnauthorized access occurred to the passenger service system provided by Amadeus, resulting in unauthorized access to reservation information for our flights by a third party. There are indications that some customers' personal information was referenced. We are currently rushing to identify the extent of the impact.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-705Kagoshima BankKagoshima Bank announced unauthorized access to Paydon, with a possibility of personal information leakage. Specific details about the damage have not been disclosed.
Unauthorized access & data leakPossibleOfficial statement
LEAK-712Consumer Affairs AgencyThe Consumer Affairs Agency announced that a data breach involving personal information occurred due to unauthorized access and urged caution.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-722Good Smile CompanyGood Smile Company announced that unauthorized access to its official online store may have resulted in the leakage of credit card information for up to 2,800 customers. The leaked information includes the full 16-digit card numbers and security codes. The tampering lasted for approximately 41 hours, affecting customers who entered information on the payment page during a specific period.
Unauthorized access & data leakUnverified reportNews report
LEAK-726Municipalities and Government AgenciesA summary of information leakage incidents published in 2026 includes 1,840 cases. Notably, large-scale leaks have been confirmed at Kyushu University and Hanakyu-Pit.
Unauthorized access & data leakUnverified reportNews report
LEAK-729GMO Internet Group Inc.GMO announced that its services were subject to unauthorized access, and its internal white-hat hacker team obtained information leading to the identification of the perpetrator. A reward of approximately 150 million yen was prepared, and within six hours, 113 pieces of information were provided.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-742Cox Co., Ltd.Cox Co., Ltd.'s server was encrypted by ransomware, potentially leaking the names, addresses (some), and phone numbers (some) of customers who requested watch repairs at four stores since September 2025. The company detected the attack on September 15, 2026, blocked external connections, and reported to the four stores on September 25.
RansomwareUnverified reportNews report
LEAK-747Rion Co., Ltd.Reports indicate that unauthorized access and information leakage occurred at Rion Co., Ltd.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-752Claris International Inc.The page regarding Claris International Inc. contains information related to AI, but does not clearly state any specific security incidents.
Unauthorized access & data leakUnverified reportNews report
LEAK-758BlueskyUnauthorized access occurred to Sagawa Express, with a potential leak of approximately 53,230,000 personal information records.
Unauthorized access & data leakPossibleOfficial statement
LEAK-772Kanagawa PrefectureKanagawa Prefecture announced that its email newsletter distribution service was subject to unauthorized access, potentially leaking approximately 7,800 pieces of personal information. The prefecture has urged registrants to be cautious of suspicious emails and messages.
Unauthorized access & data leakUnverified reportNews report
LEAK-781NTT DocomoThe cashless payment service "Pay Don" may have leaked users' email addresses and payment information. A contractor reported unauthorized access, and the email notification function was suspended. Approximately 220,000 users are registered for the service, which had a payment amount of 10.5 billion yen last year.
Unauthorized access & data leakPossibleOfficial statement
LEAK-785Ministry of Foreign AffairsThe Ministry of Foreign Affairs announced that two Japanese nationals were confirmed to be on the passenger list related to a train accident in Spain. The ministry has established a local response headquarters and is verifying the safety of the two individuals.
Unauthorized access & data leakUnverified reportNews report
LEAK-803Asunaro ClubThe non-profit organization Asunaro Club in Namerikawa City, Toyama Prefecture, was stripped of its designation by Toyama Prefecture for abusing disabled individuals undergoing employment training and illegally receiving benefits. It was revealed that the chairman verbally abused users and failed to pay wages.
Unauthorized access & data leakUnverified reportNews report
LEAK-823Ichikawa CityIchikawa City announced that there was unauthorized access to Yumirlink Corporation, which is entrusted with email distribution services for the hometown tax portal site "Sato Furu," resulting in a partial leak of personal information. The scope of the impact is currently under investigation, and residents are urged to check the "Sato Furu portal site" for details.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-829Life Card Co., Ltd.Reports indicated a potential information leak involving Life Card contract holders. The number of contract holders is approximately 339,000, with further details unknown.
Unauthorized access & data leakUnverified reportNews report
LEAK-846Peikuraud HoldingsUnauthorized access occurred on some servers of the email distribution service operated by a consolidated subsidiary of Peikuraud Holdings, potentially exposing approximately 3,010,000 email addresses. They plan to strengthen their security measures to prevent recurrence.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-856Imperial Household AgencyOn October 21, regarding Their Majesties the Emperor and Empress's visit to Osaka Prefecture, the visit was declined due to a cyber attack suffered by Osaka Public University on October 2. This affected the departure time of Their Majesties.
Unauthorized access & data leakUnverified reportNews report
LEAK-859Chugoku Electric PowerChugoku Electric Power announced that approximately 17,600 pieces of personal information may have been leaked in connection with unauthorized access to Sagawa Express's member services. The leaked information includes members' names, addresses, and phone numbers used for product exchanges. While no misuse of the information has been confirmed, they are urging caution against suspicious phone calls.
Unauthorized access & data leakUnverified reportNews report
LEAK-877ANA (All Nippon Airways)ANA (All Nippon Airways) announced that there was unauthorized access to the passenger service system of Amadeus. There are indications that some customer personal information was accessed, but specific details are still being confirmed.
Unauthorized access & data leakPossibleOfficial statement
LEAK-942Constitutional Democratic PartyThe Constitutional Democratic Party held an emergency meeting of the entire policy committee on October 28 in response to a series of unauthorized access incidents and personal information leaks affecting companies. The specific contents of the proposal to the government have not been disclosed, and the government plans to compile an emergency response package next week.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-980Dai Nippon Printing Co., Ltd.Dai Nippon Printing Co., Ltd. announced that customer information from its hybrid comprehensive bookstore "honto" may have been leaked due to unauthorized access. The potentially leaked information is limited to names, email addresses, and internal system identification numbers, and does not include other personal information.
Unauthorized access & data leakConfirmedOfficial statement

Showing 20 of 29 cases

Incidents on Oct 29, 2026