Aflac Japan Data Breach Hits 4.4 Million Customers

Aflac Japan faces a data breach affecting 4.4M customers, compromising personal and banking details. US operations remain secure.

By Content Team

Jul 2, 2026

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Aflac has disclosed a significant data breach at its Japanese subsidiary, affecting nearly 4.4 million customers. Hackers were inside Aflac Japan's systems from June 15 until discovery on June 25, stealing policy details, personal information, and bank account data — including premium payment records for around 230,000 customers.

The company filed with the SEC on June 30, confirming US operations were unaffected. Some customer portal services remain offline, including medical check-up reservations and the AI support concierge, though claims and payments continue via call centers. Aflac Japan has notified authorities and says no misuse has been confirmed yet.

No attribution has been made, though researchers have raised the possibility of Scattered Spider involvement — the group blamed for a 2025 intrusion at Aflac. It's the third breach Aflac has disclosed since 2023. Anyone with premium payments set up should keep an eye on their bank account regardless.

Source: Infosecurity Magazine

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