Data breach at Sony ISP subsidiary exposes 2.5 million customer records as Japan hit with another major cyberattack
- Sony Network Communications discloses breach affecting roughly 2.5 million ISP customers and former users
- Exposed data included personal details, while some email service users also lost email passwords
- Company contained the intrusion, notified authorities, and warned customers about phishing and fraud risks
A subsidiary of Sony Network Communications, the Japanese tech giant’s Internet Service Provider (ISP) arm, has confirmed suffering a data breach which saw it lose sensitive data on roughly 2.5 million people.
Among the stolen files were people’s phone numbers, email addresses, and in some cases - email passwords.
The company confirmed the news in an apology and notice letter in which it said threat actors accessed So-net, the company’s consumer-facing ISP service brand. The identity of the attackers was not disclosed, and nor was the method they used to break in. The breach happened on Monday, October 19 2026, and was spotted four days later,...
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