Reported breach

Cybersecurity Cloud data breach

JPJapan · Technology and telecom · サイバーセキュリティクラウド

Security NEXT reported a data breach at Cybersecurity Cloud (Japan) on 13 November 2026.

People affected: Not reportedno count given yet
Reported: 13 November 2026News report

What was exposed 4

Email addresses
Names
Organization names
Communication-related information

How it happened

Way in: GitHub The company's environment on GitHub, which is used for software development and other purposes, was compromised. source
Our translation from Japanese
同社がソフトウェアの開発などに利用している「GitHub」の同社環境が侵害されたもの

Sources 1

News reportSecurity NEXTAuthentication credentials leaked, unauthorized access to GitHub environment - CSC (our translation from Japanese)13 November 2026

News reports are read by an AI model; every fact taken from an article was checked word for word against it, and anything it could not find was dropped. · Corrections and changes

If Cybersecurity Cloud had your data

Look for Cybersecurity Cloud’s own notice or letter: it should say what of yours was involved. Keep it.
Your email address is out: expect convincing phishing. Open Cybersecurity Cloud by typing its address yourself, never through a link in an email or text, and check the sender before you reply.
Expect scams that use your details: calls, texts or emails pretending to be Cybersecurity Cloud, your bank or the police. Never give codes or passwords, never approve a sign-in you did not start, never move money.

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Questions about the Cybersecurity Cloud breach

Was Cybersecurity Cloud hacked?

Security NEXT reported a data breach at Cybersecurity Cloud (Japan) on 13 November 2026. How it happened, by the sources: through GitHub. It has been reported but not confirmed by Cybersecurity Cloud or an authority.

What data was exposed in the Cybersecurity Cloud breach?

Email addresses, Names, Organization names and Communication-related information, by the notices and reports on this page.

How do I know if I was affected?

Organisations normally tell the people whose data was involved, by letter or email, and that notice says what of yours was in it. We cannot look up individual people. If you got a notice, check that it is real, then follow the steps on this page.

Is there a Cybersecurity Cloud data breach settlement?

No settlement open for claims is on record for Cybersecurity Cloud as of 15 November 2026. Every open settlement is listed with its deadline.

Is a letter, email or text about the Cybersecurity Cloud breach real or a scam?

A real notice names the breach, says what data was involved and never asks for a password, a code or a payment. Criminals often send fake notices after a breach is in the news. Do not use links or phone numbers in the message: go to Cybersecurity Cloud’s own site, or check the letter here.

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From the data breach tracker: official notices, breach databases and the news, every fact with its source. Open data (CC BY 4.0) · How the tracker works · Official registers · Corrections and changes · Accuracy audit · For journalists · Found a mistake? Tell us and we correct it.