The Record reported a data breach at City of Osaka (Japan) on 13 November 2026. It affected 1,000,000 email addresses.
One of 2 organisations whose data was taken through Arara. The Arara breach →
What we know as of
Status
Reported by The Record; not yet confirmed by City of Osaka or an authority.
People affected
1,000,000 email addresses.
What was exposed
Email addresses.
When
First reported 13 November 2026.
How
Hacking, through Arara.
City of Osaka’s record
No earlier breach on record under this name.
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
People affected
1,000,000email addresses
Reported
13 November 2026News report
What was exposed 1
Email addresses
How it happened
How
Hacking hackers accessed the Arara email distribution servicesource
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
Questions about the City of Osaka breach
Was City of Osaka hacked?
The Record reported a data breach at City of Osaka (Japan) on 13 November 2026. It affected 1,000,000 email addresses. How it happened, by the sources: hacking, through Arara. It has been reported but not confirmed by City of Osaka or an authority.
What data was exposed in the City of Osaka breach?
Email addresses, 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 City of Osaka data breach settlement?
No settlement open for claims is on record for City of Osaka as of 15 November 2026. Every open settlement is listed with its deadline.
Is a letter, email or text about the City of Osaka 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 City of Osaka’s own site, or check the letter here.
Privacy Unpacked