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Incidents on Oct 31, 2026

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

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Showing 13 of 13 incidents

Incidents on Oct 31, 2026
DateTargetSummaryClassificationSource links
LEAK-935Unauthorized AccessS 15,821,184 recordsCases of extortion due to unauthorized access have surged globally, with over 6,000 confirmed cases reported between October 2024 and September 2025, representing an approximately 45% increase compared to the same period last year.
Unauthorized access & data leakUnverified reportNews report
LEAK-820YumemachiS 4,454,097 recordsTrust Bank Co., Ltd. confirmed that unauthorized access to Furusato Choice resulted in the leakage of 4,454,097 records of personal information. The leaked information included names, email addresses, addresses, phone numbers, hashed passwords, and estimated donation deduction amounts.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-850Japan TicketB About 70,000 peopleUnauthorized access occurred to the reservation system for the Yoshida Route on the Yamanashi side, with reports suggesting that personal information of approximately 70,000 mountain climbers may have been leaked.
Unauthorized access & data leakUnverified reportNews report
LEAK-844Credit Saison Co., Ltd.C 1,889 peopleOn October 29, 2026, unauthorized access occurred to a membership management platform provided by an external contractor of Credit Saison Co., Ltd., resulting in the leakage of personal information of 1,889 people. The leaked information included names, email addresses, addresses, dates of birth, phone numbers, nationalities, and information regarding dividend payment accounts. Credit card information was not leaked.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-893Matsue CityD 307 peopleA collective food poisoning incident occurred at three elementary schools in Matsue City due to fish dishes served at lunch, affecting 307 people who reported feeling unwell. The cause was histamine found in the "Hamachi with Yuzu Pepper Grilled" dish, leading to the suspension of operations at the lunch center.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-817Ministry of Economy, Trade and IndustryUnauthorized access occurred to the reservation system for the membership-based exchange space of the Ministry of Economy, Trade and Industry, and it was reported that personal information of approximately 1,100 people may have been leaked.
Unauthorized access & data leakUnverified reportNews report
LEAK-818Iwakuni CityThere was a report of a possible data breach involving unauthorized access to Studio, which may have led to the leakage of personal information. Specifically, information entered through the website's application and inquiry forms may have been exposed. As of now, there is no confirmation that any third party has obtained this information, but Studio is conducting an investigation.
Unauthorized access & data leakPossibleOfficial statement
LEAK-824Rakuten SecuritiesRakuten Securities announced that there was unauthorized access to an external service provider, potentially leading to the leakage of customer information. Specific details regarding the extent of the damage or the number of affected individuals have not been disclosed.
Unauthorized access & data leakPossibleOfficial statement
LEAK-827Life Card Co., Ltd.Unauthorized access by a third party was confirmed in a contractor's system related to the V Preca service provided by Life Card Co., Ltd., and there is a possibility that personal information has been leaked. A detailed investigation is currently underway.
Unauthorized access & data leakPossibleOfficial statement
LEAK-831Club TourismClub Tourism announced a personal information leak due to unauthorized access and issued an apology. The leaked information may include members' names, addresses, phone numbers, and email addresses.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-920MatsuyaThe operator of the beef bowl chain Matsuya announced that its official app management system was accessed illegally, resulting in the leakage of information for approximately 2,380,000 customers, including names and phone numbers.
Unauthorized access & data leakUnverified reportNews report
LEAK-931Iki City, Nagasaki PrefectureIki City, Nagasaki Prefecture, imposed a disciplinary action of a 10% salary reduction for six months on a male employee in his twenties at the fire department for unauthorized access to internal information using the ID and password of other employees. The employee repeatedly accessed the internal information system from April 2025 to August 2026, viewing personnel transfer information and personal information of employees before it was publicly announced.
Unauthorized access & data leakConfirmedOfficial statement
LEAK-943Democratic Party for the PeopleDemocratic Party for the People's leader Yuichiro Tamaki cited a cyber attack on GMO Internet Group as an example and proposed a revision of laws for proactive cyber defense. He pointed out that the attacking AI has no restrictions, which could create a capability gap with the defenders, and stated that it is necessary to improve the legal framework.
Supply chainPossibleOfficial statement
Incidents on Oct 31, 2026