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Hackers Steal Data of 4.38 Million Aflac Japan Customers

Securityaffairs.Co •Pierluigi Paganini • June 30, 2026

Hackers stole data from 4.38 million Aflac Japan customers after accessing its systems for 10 days before the breach was detected. Aflac Japan disclosed that hackers stole the personal information of 4.38 million customers and agents after gaining access to its systems between June 15 and June 25. Attackers stole data from the company policyholder […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Aflac Japan Data Breach Affects 4.38 Million Customers Aflac Japan disclosed a data breach affecting 4.38 million customers after unauthorized access to its systems between June 15 and June 25, 2026. The breach was detected on June 25, prompting the suspension of certain systems while continuing to serve policyholders. The attackers accessed sensitive personal and financial information, including policy details and bank account data. Aflac has engaged external cybersecurity experts for investigation and notified relevant authorities, confirming that U.S. systems were not compromised. The full scope of the breach and its potential impact remain under investigation. This incident follows a previous breach in 2023 attributed to the same threat group, Scattered Spider. 14 sources 69

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Hackers Steal Data of 4.38 Million Aflac Japan Customers

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Extracted Entities

Attack Types (1)

Companies (1)

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MITRE ATT&CK (1)