Over 14 million login credentials leaked from six ISPs in major data breach — here’s what we know
- Tens of millions of credentials may have been leaked following an attack on one of Japan's largest ISPs
- The attack leveraged a vulnerability in a third-party software used by KDDI
- Five other ISPs were also affected in the attack
A data breach that has potentially exposed the email and password combinations for over 14 million customers across six internet service providers (ISPs) has been disclosed by Japanese telecoms provider KDDI Corporation.
According to the company, hackers exploited a vulnerability in a third-party software to access the database of credentials. KDDI said that it immediately blocked the hackers' access after discovering the intrusion on June 17, 2026.
“Although technical defensive measures have already been implemented for the system, there remains a possibility that customers' email addresses and passwords were obtained by unauthorized third parties as a result of the incident,” the company said in a statement.
Millions of credentials exposed
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