BreachPublished 30 Jun 2026

Aflac Japan Data Breach Impacts 4.38 Million

Source SecurityWeek

Description

Hackers accessed the insurance giant’s policyholder portal multiple times between June 15 and June 25. The post Aflac Japan Data Breach Impacts 4.38 Million appeared first on SecurityWeek .

Impact

The breach exposed sensitive personal and insurance-related information of approximately 4.38 million individuals, potentially increasing the risk of identity theft, fraud, and targeted phishing attacks. The exposure of insurance premium transfer account information for around 230,000 people could lead to financial fraud attempts. Service disruptions affected at least five Aflac Japan services, with no estimated restoration timeline provided. The breach did not impact Aflac's US business systems. No credit card information was compromised, limiting the scope of financial data exposure.

Defensive guidance

Aflac Japan has taken immediate containment measures by suspending affected systems to prevent further unauthorized access. The company is conducting an ongoing investigation supported by third-party cybersecurity experts and has notified relevant authorities. Affected customers will receive notification letters detailing the specific information exposed. Organizations should monitor communications from Aflac Japan for updates and follow any guidance issued.

References

securityweek.com/aflac-japan-data-breach-impacts-4-38-million/ (opens in a new tab)

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Description

AI analysisMachine-generated, updated 30 Jun 2026, 13:06 UTC

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