1
Published signals
currently linked to this company
Company intelligence
Kddi cybersecurity incidents and threat signals
kddi.com
This company page brings together public reporting currently associated with Kddi. It reflects signals published by Shadow Tier and should not be read as a complete incident history.
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Last 28 days
recent published signals
1
Last 90 days
recent published signals
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High or critical
confidence classifications
June 30, 2026
Latest report
most recent published signal
Company signals
All published signals involving Kddi
KDDI Corporation Data Breach Exposes up to 14.2 Million Email Accounts
Japanese telecommunications operator KDDI Corporation disclosed a data breach where threat actors gained access to one of its email systems, which is also used by five other internet service providers in the country. The company discovered the intrusion on June 17, 2026, and immediately blocked the attackers. The breach was caused by exploiting a vulnerability in unnamed third-party software used in the email system. Up to 14.2 million email addresses and passwords, including those of current and former customers, may have been exposed.
FAQ
Questions about Kddi cybersecurity reporting
What does the Kddi page include?
It combines a reviewed organization profile with all current published Shadow Tier signals explicitly linked to Kddi.
Does every mention of Kddi appear here?
No. A signal must contain a reliable company connection and meet the publication criteria; incidental or ambiguous mentions are excluded.
Why can the incident count change?
The page follows current published reporting. Counts change as new evidence is added, classifications are reviewed, or older signals leave the reporting window.