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Ryohin Keikaku (MUJI)
Tokyo, Japan2 sources
Confirmed:Confirmed by the organisation, a regulator or a securities filing. First reported 4 Nov 2026.
MUJI confirms credit card data breach affecting over 1 million customers
Retail giant Ryohin Keikaku, operator of MUJI, confirmed that credit card information of approximately 1.09 million customers may have been compromised. The breach affects MUJI Card members who joined prior to July 2021.
- Type
- Data breach
- Sector
- Retail
- Records
- 1.1M 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 Ryohin Keikaku (MUJI)
Sources
2- tokyoreporter.com4 Nov 2026tokyoreporter.com/japan-news/muji-reveals-massive-data-breach-over-1-million-credit-card-numbers-potentially-compromised
- getleaktrace.com4 Nov 2026getleaktrace.com/breaches/2026
Confidence 80% that this is real and correctly placed. Locations are city centroids at best. Spotted an error? Report a correction.