Reported breach
JPJapan · アルカディア
FNN Prime Online reported a data breach at Arcadia (Japan) on 2 November 2026. It affected 3,000,000 records.
Not known yet: when it began and who was behind it. This page is updated as notices and statements come in.
Every fact above has its source below. Journalists: free to quote with credit (“Privacy Unpacked data breach tracker”, with a link to this page and the date); the figures can move. Follow this breach (feed) · Every major breach · Ask us for a figure
We were subjected to a cyberattacksource
Privacy Unpackedサイバー攻撃を受けました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
FNN Prime Online reported a data breach at Arcadia (Japan) on 2 November 2026. It affected 3,000,000 records. How it happened, by the sources: hacking. It has been reported but not confirmed by Arcadia or an authority.
Email addresses, by the notices and reports on this page.
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.
No settlement open for claims is on record for Arcadia as of 15 November 2026. Every open settlement is listed with its deadline.
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 Arcadia’s own site, or check the letter here.
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.