Muji breach: up to 27.26 million customer records and 1.09 million full MUJI Card numbers may have leaked

Teaser from the source

Ryohin Keikaku, the company behind Muji, says unauthorized access to its systems on Oct 29 2026 may have exposed up to about 27.26 million MUJI app and Muji online store customer records (email addresses, birth dates, gender and member IDs, including former members), about 520,000 of them with names, addresses and phone numbers. Its Nov 4 follow-up adds about 1.09 million MUJI Card records holding full card numbers, birth dates and MUJI Card IDs, which the company had kept from a pre-2021 points scheme; about 345,000 of those cards are still valid. Cardholder names, expiry dates and security codes were not included. Card issuer Credit Saison has seen no rise in fraud, is monitoring the cards and reissues them on request. Ryohin Keikaku says it blocked the access and has found no sign of the data on the dark web so far.

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