1
Published signals
currently linked to this company
Company intelligence
Stnet cybersecurity incidents and threat signals
stnet.co.jp
This company page brings together public reporting currently associated with Stnet. It reflects signals published by Shadow Tier and should not be read as a complete incident history.
Company links
0
Last 28 days
recent published signals
1
Last 90 days
recent published signals
0
High or critical
confidence classifications
June 29, 2026
Latest report
most recent published signal
Company signals
All published signals involving Stnet
STNet, Inc. Affected by KDDI Corporation Data Breach
STNet, Inc., a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. STNet customers' email addresses and passwords may have been compromised.
FAQ
Questions about Stnet cybersecurity reporting
What does the Stnet page include?
It combines a reviewed organization profile with all current published Shadow Tier signals explicitly linked to Stnet.
Does every mention of Stnet 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.