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Paycloud Holdings
Tokyo, Japan3 sources
Confirmed:Confirmed by the organisation, a regulator or a securities filing. First reported 2 Nov 2026.
Paycloud says 77 million email addresses leaked from subsidiary
Tokyo-based IT services firm Paycloud Holdings said about 77 million email addresses were leaked after hackers gained unauthorised access to servers run by its subsidiary operating the Arara Message email distribution service. Data of up to about 380 corporate clients was exposed, including names, phone numbers and addresses, though no credit card numbers were leaked.
- Type
- Data breach
- Sector
- Technology
- Records
- 77M records confirmed
- First reported
- 2 Nov 2026
- Latest source
- 4 Nov 2026
What to do
- If you have an account, change that password, and anywhere you reused it.
- Turn on two-factor authentication, ideally an authenticator app or passkey, not SMS.
- Expect phishing that uses your real details. Do not click links in messages about this incident; go to the company's site directly.
- If payment cards were involved, watch statements and ask your bank for a new card.
- If government ID or social security numbers were involved, consider a credit freeze.
- If this is a vendor of yours, ask what of your data they held and whether it was in scope.
- Reset any API keys, SSO trusts or shared credentials you have with them.
- Brief your help desk: attackers often impersonate the breached brand next.
Not sure? Ask an assistant with the sources attached, or have a coding agent check your systems.
Check your systems for Paycloud Holdings
Sources
3- portalmie.com4 Nov 2026portalmie.com/atualidade/2026/11/ataque-hacker-no-japao-expoe-77-milhoes-de-e-mails-e-acende-alerta
- ipc.digital4 Nov 2026ipc.digital/suntory-holdings-affirme-que-les-donnees-personnelles-denviron-100-000-personnes-ont-ete-divulguees
- japantimes.co.jp3 Nov 2026japantimes.co.jp/news/2026/11/03/japan/society/japan-firms-report-more-data-breaches
Confidence 90% that this is real and correctly placed. Locations are city centroids at best. Spotted an error? Report a correction.