Mos Food Services
Tokyo, Japan2 sources
Confirmed:Confirmed by the organisation, a regulator or a securities filing. First reported 4 Nov 2026.
Mos Food Services breach affects 7.5 million customers via supplier
Fast-food chain Mos Burger reported a data breach impacting 7.5 million customer records following the compromise of its email marketing provider Arara. Personal information was potentially accessed.
- Type
- Data breach
- Sector
- Food
- Records
- 7.5M records confirmed
- First reported
- 4 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 Mos Food Services
Sources
2- news.web.nhk.jp4 Nov 2026news.web.nhk.jp/newsweb/na/nd-20261104de70170
- mos.co.jp4 Nov 2026mos.co.jp/company/pr_pdf/pr_261104_2.pdf
Confidence 80% that this is real and correctly placed. Locations are city centroids at best. Spotted an error? Report a correction.