Joshin (formerly Joshin Denki) Data Breach History

This page tracks the Joshin (formerly Joshin Denki) data breach history and cybersecurity incidents affecting Joshin (formerly Joshin Denki) (Japan). BreachHistory currently indexes 1 publicly disclosed or catalogued incident spanning 2026, with approximately an unknown number of records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.

The Joshin (formerly Joshin Denki) breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed.

Largest Joshin (formerly Joshin Denki) Data Breaches

Indexed Joshin (formerly Joshin Denki) incidents are listed below. Where a public count is unavailable, the catalog shows unknown records exposed. Open each page for attack method, data types, and sources.

• 2026 2026 Joshin — third-party unauthorised access to member database, subscription service and reform-photo system; up to 6 million member records — about Unknown records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include passwords and login credentials, phone numbers, names, physical addresses, bank account details, profile information, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

Joshin (formerly Joshin Denki) Data Breach 2026

At the time of this update, BreachHistory catalogues 1 2026 incident related to Joshin (formerly Joshin Denki). Most recent entry: 2026 Joshin — third-party unauthorised access to member database, subscription service and reform-photo system; up to 6 million member records. New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.

What To Do If You Were Affected

If you believe your account may have been involved in a Joshin (formerly Joshin Denki) data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.

This Joshin (formerly Joshin Denki) breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.