Summary: On Friday 6 November 2026, Ryohin Keikaku, the company behind MUJI, suspended the whole MUJI online store (Muji netto sutoa) and almost all of the MUJI app to strengthen security. It aims to restart within one to two days, but has not given a date. MUJI stores in Japan are open as usual, and the membership barcode in the app still works. The stop follows a data incident that the company says may affect up to about 27.26 million records. If you ever held a MUJI Card that you joined by July 2021, check your card statement. Everyone with an account should be careful with messages that claim to be from MUJI.
What is stopped, and what still works
| Service | Status on 6 November | What you can do |
|---|---|---|
| MUJI stores | Open as usual | Shop in person |
| Online store | All services and functions stopped | Wait for the official restart notice |
| MUJI app | Stopped, except the MUJI Members barcode | You can still show the barcode at a store |
| Orders you already placed | Not explained in the 6 November notice | Ask through the online store order inquiry form |
Checked: 2026-11-06. Sources: Ryohin Keikaku third notice and the MUJI maintenance page.
The company describes the stop as extra security work. The 6 November notice does not say that a new leak was found, and it does not change the groups of people described on 4 November.
Who may be affected
The company first announced the incident on 30 October and widened it on 4 November. The second notice added online store members who do not use the app, and people who have left the service. Use this table to find your group. You can be in more than one.
| If you… | Information that may have been accessed | Scale |
|---|---|---|
| Have used the MUJI app or online store, including former members | Email address, date of birth, gender, member ID | Up to about 27.26 million records |
| Are in a part of that group | Also name, address and phone number | About 520,000 records |
| Joined the MUJI Card between October 2000 and July 2021, including cancelled and expired cards | Full card number, MUJI Card ID, date of birth. For some people, also name, address, phone number, gender and email address | About 1.09 million records (about 345,000 cards still usable) |
| Saved a credit card in the app or online store (some users only) | First 6 and last 2 digits, and the name on the card | About 120 records |
Checked: 2026-11-06. Sources: Ryohin Keikaku second notice and Credit Saison.
The company and the card issuer say card expiry dates and security codes are not included. MUJI Cards issued in August 2021 or later are not affected. On 4 November, the company said it had not confirmed any leak to the dark web or any misuse of the data. Credit Saison said it had not confirmed a rise in fraudulent MUJI Card use.
People affected will be contacted by email or post, in turn. Credit Saison will contact MUJI Card members whose details MUJI does not have. Because notices go out in turn, having no message yet does not prove you are safe.
What you can do now
- If you have a MUJI Card, check your statement. Look for charges you do not recognize. Contact Credit Saison if you find one. You can see the month you joined in Saison Portal or Net Answer, under the menu for checking your customer details (okyakusama joho no kakunin / henko).
- Consider a new card if you are worried. You can ask for a reissue in Net Answer or Saison Portal. It takes time to arrive. Your card number will change, so you may need to update bills that are paid with that card.
- Do not give card details to anyone who contacts you. The company says it never asks for credit card information by email or phone. Do not trust a caller just because they know your address or birthday. Our guide to fake SMS messages in Japan shows how to check a message safely.
- Do not use links in “restart” messages. While the store is stopped, a message saying “log in again” or “the store has reopened” could be fake. Type the official address yourself, or use the news page on the official site.
- Change reused passwords. The notices do not mention passwords. Even so, if you use one password on many services, this is a good time to give your important accounts their own passwords.
Warning signs in fake messages
- An “apology coupon” or “points as compensation” that asks you to log in or enter a card number
- A message that says your card was misused and rushes you to give a number, PIN or security code
- A request to call back a phone number written in the message or letter
- A sender address or link that does not match the official website
If you are unsure, Japan’s police consultation line #9110 and how to handle fake calls are explained in our guide.
Who to contact
| Question | Contact | Hours |
|---|---|---|
| Personal data, app and online store accounts | Ryohin Keikaku Customer Service: 0120-64-0772 | 9:30 to 17:00, every day until 26 December. Monday to Saturday from 4 January 2027 |
| MUJI Card statement or reissue | Credit Saison: 0120-227-190 | 10:00 to 17:00, every day until 26 December. Monday to Saturday from 4 January 2027 |
| Online store orders | Order inquiry form | Form (Japanese) |
Checked: 2026-11-06. The notices do not mention English support, so a Japanese-speaking friend may be useful for calls. Lines may be busy. Check these numbers on the official pages below, not in a message you received.
There is also a separate case. On 2 November, the company announced unauthorized access at a contractor’s server for made-to-order curtains. It covers 19,933 records of orders placed from 10 April 2018 to 25 January 2022. Those people will be contacted by post.
FAQ
Can I still use my MUJI membership in a store?
Yes, the app can still show the MUJI Members barcode, and stores are open as usual.
When will the online store come back?
The company’s target is within one to two days of the 6 November notice. No exact date has been given. Check the official page.
I only shop at MUJI stores. Am I affected?
The notices are about the app, the online store and the MUJI Card. If you have none of these, you are outside the groups listed above.
Should I cancel my MUJI Card?
The notices do not ask you to cancel it. They point to checking statements, and to a reissue if you want one. The choice is yours.
Does this affect MUJI outside Japan?
The notices we read cover the Japanese online store, app and card. They do not explain overseas services.
Related reading
Sources
- Ryohin Keikaku: third notice, online store suspended, 6 November 2026 (Japanese)
- MUJI: maintenance page, 6 November 2026 (Japanese)
- Ryohin Keikaku: second notice, 4 November 2026 (Japanese)
- Credit Saison: MUJI Card notice, 4 November 2026 (Japanese)
- Ryohin Keikaku: first notice, 30 October 2026 (Japanese)
- Ryohin Keikaku: made-to-order curtains notice, 2 November 2026 (Japanese)
- Fashionsnap: MUJI online store stop, 6 November 2026 (Japanese)
