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2rinkan confirms app API breach affecting 3,179,454 people
The June 19 final report confirmed personal-information exposure affecting 3,179,454 people. The earlier maximum of 3,455,754 is not retained as an exact total.
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Tokyo Monorail: data of about 3,400 people may have leaked after loss of a desktop PC awaiting disposal
Possible data leak: A desktop PC from Haneda T2, staged for disposal in the T1 warehouse, could not be found during an April 3, 2026 disposal check; disclosed April 23.
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Mazda Hospital: data of 626 patients may have leaked after imaging contractor cloud misconfiguration
Possible data leak: An imaging contractor mis-set cloud sharing so files were readable by unauthorised parties from early April 2023 to mid-December 2024; disclosed April 23, 2026.
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Taisei Housy: customer data may have leaked via ielove CLOUD intrusion
After ielove’s CLOUD-intrusion disclosure and an April 20 report saying some Taisei customer data may have leaked, the firm disclosed on April 22.
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Takahata Town: data of 2,354 people in the paddy-conversion system may have leaked via YCC
Possible data leak: After the April 2, 2026 attack on maintenance contractor YCC, paddy-conversion system data was found on the vendor server; disclosed April 20. Exfiltration not confirmed.
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Clearth Rent: customer data may have leaked via ielove CLOUD intrusion
Possible data leak: ielove reported unauthorised access and data acquisition on April 5–6, 2026; Clearth’s April 20 notice and May 13 follow-up listed name, email, phone, address and preferences among leaked fields.
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Oguni Town: 1,369 welfare-medical records may have leaked via YCC ransomware
Possible data leak: After the April 2, 2026 attack on former contractor YCC, April 2019 welfare-medical data was found on the vendor server; disclosed April 17.
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Nihon Zaitaku: customer data may have leaked via ielove CLOUD intrusion
After receiving ielove’s April 16, 2026 investigation report on the April 5–6 CLOUD intrusion, Nihon Zaitaku disclosed possible customer-data leakage on April 17.
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Kaneyama Town: town clinic patient data may have leaked via YCC ransomware
Possible data leak: After the April 2, 2026 YCC attack, clinic medical-admin data was found on the vendor server by April 16; disclosed April 17.
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Rize Clinic: patient LINE data may have leaked after LINE-delivery-system intrusion
After suspicious LINE messages on April 9, 2026, an April 17 update said LINE display names, clinic, campaign interest and some chat history may have leaked. Chart name/phone fields are not stored in that system.
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Satte City: national-health data of 34,330 people may have leaked via subcontractor YCC
Possible data leak: AGS maintained the high-cost medical-care system and subcontracted to YCC. After YCC’s April 2, 2026 attack, city data held there was found on April 8; first notice April 17 and headcount on May 25.
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Yamagata Prefecture: about 26,800 entrusted records may have been exposed via YCC ransomware
Possible data leak: After the YCC file-server attack, the prefecture disclosed on April 17 that related data known as of April 16 had been stored on that server. No impact confirmed on live operational systems.
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Yamagata Kotsu: bus and taxi customer data may have leaked via YCC ransomware
Possible data leak: After the April 2, 2026 YCC attack, build-contract data including ended contracts was found on the vendor server by April 16; disclosed April 17.
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Nippon Rent-A-Car: car-share member data may have leaked via Nippon Telenet ransomware
Possible data leak: After Nippon Telenet (UPR subcontractor for car-share call centres) was attacked on March 9, 2026, UPR reported on April 13 and Nippon Rent-A-Car disclosed April 17. Rental-car members out of scope.
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Yamako: 2,398 customer and staff records may have leaked via YCC ransomware
Possible data leak: After the April 2, 2026 YCC attack, core-system data including ended contracts was found on the vendor server by April 17.
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Shonai Town: library and training-room users may have leaked via YCC ransomware
Possible data leak: After the April 2, 2026 YCC attack, build-time data from the town and its designated manager was found on the hit server by April 17.
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Jusnet reports possible data leak from employee Chatwork account
Unauthorised access to an employee’s Chatwork account may have exposed names, contacts and business/service-use information. No affected-person or record total was published.
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Yokosuka City: data of 145 people and 12 firms leaked via misattached tax FP-consultation list
On April 8, 2026 the tax office emailed the wrong FP-consultation list to another firm; noticed April 15 after one recipient opened then deleted it; disclosed April 16.
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Yamagata City: staff and resident data may have leaked via contractor YCC ransomware
Possible data leak: After the April 2, 2026 YCC attack, a review through April 15 found city data including ended contracts still on the vendor server; disclosed April 16.
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Cecile: customer data may have leaked via Nippon Telenet cyber-attack on fax-sending contractor
Fax contractor Nippon Telenet was attacked on March 9, 2026; on April 8 Cecile was told a Feb 24 fax-send backup may have been on the hit server and disclosed April 16.