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KDDI Data Breach May Have Exposed Up to 14.22 Million Email Accounts

ID: 1eaf6b7c-d2bd-5d01-a89c-9eda816969e2

STIX ID: report--1eaf6b7c-d2bd-5d01-a89c-9eda816969e2

Feed Name: The Cyber Express

Threat Score
78/100

Date Published: 2026-06-24

Date Updated: 2026-06-24

Author: Ashish Khaitan

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KDDI disclosed a data breach detected on June 17, 2026 in which vulnerabilities in third‑party email system software used by multiple ISPs were exploited, potentially exposing up to 14.22 million email addresses and passwords; the company is coordinating notifications, urging password resets, strengthening controls, and working with regulators.

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