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Cabinet Office (Japan) data breach

Cabinet Office (Japan) announced a data breach on Nov 11, 2026 affecting about 62,863 email addresses, exposing email addresses and names. It happened through a vendor (Arara (Arara Message email delivery service)). No settlement or compensation has been announced.

Was I affected?

Subscribers of 14 Cabinet Office email newsletters, including those of the Public Interest Corporation Commission and the Food Safety Commission.

Cabinet Office (Japan) breach facts
AnnouncedNov 11, 2026
CountryJapan
Email addresses exposed62,863
Data exposedEmail addresses, Names and Other details
Through a vendorArara (Arara Message email delivery service)
StatusConfirmed by the company or a regulator filing

What happened

Japan's Cabinet Office said on November 11, 2026 that 62,863 email addresses registered for its newsletters leaked after outsiders broke into the Arara Message email delivery service it used. Names, occupations and other details entered at sign-up may also have leaked. The 14 affected newsletters include those of the Public Interest Corporation Commission and the Food Safety Commission, and delivery has been suspended.

What should I do?

  1. Be wary of emails that appear to come from the Cabinet Office or its commissions, and don't open attachments or links in unexpected messages.
  2. Check the sender address and visit cao.go.jp directly rather than following links.
  3. Expect more spam and phishing at the address you used for the newsletter, and report suspicious messages.

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