SHINDO7

ShopServe

E-Store Co., Ltd.

shopserve.estore.jp

Personal dataup to8.9Mrecords

LEAK CONFIRMEDBank account / PasswordUnauthorized access · Investigating

Open in the live monitor ▶
Disclosed
Aug 1, 2026
Leak
Leak confirmed
Type
Unauthorized access
Status
Investigating
Security spend
Measures, no amount
Compensation
Not announced
Corporate number
8010401058455

What leaked

IdentityFull name
ContactAddress, Phone and fax numbers, Email address
Employment & HREmployer
Communications & contentOther information customers entered voluntarily
Account dataMember ID and password
CredentialsMember ID and password, ShopServe admin login IDs and passwords, shop mail system IDs and passwords, FTP IDs and passwords, ShopServe admin login IDs and passwords, shop mail system IDs and passwords, FTP IDs and passwords
Financial & paymentCardholder name, Part of the card number (first 6 and last 4 digits), Card expiry date, Bank account details for payouts from E-Store

Not leaked

  • E-Store does not hold card security codes (CVV/CVC), so they are not among the leaked data.

How many

  • Purchaser records (cumulative count) up to 8.9M records
  • Client shops that published their own notices (piyolog tally) at least 64 organizations

Who is affected

  • Purchasers
  • Members (including newsletter members)
  • Shops (merchants)

Cause

Unauthorized external access to ShopServe servers ran a malicious program (details of the vulnerability not disclosed)

Timeline

  1. Intrusion began
  2. Intrusion stopped
  3. First disclosure
  4. Report No. 2 published
  5. Parent company BASE mentioned the incident in its interim earnings report
  6. Contained
  7. Reported to authority
  8. Individuals notified
  9. Company issued an update
  10. Company issued an update

Response

  • Blocked the entry point
  • Patched
  • Password reset
  • MFA
  • Notified individuals
  • Hotline
  • Forensic investigation

Blocked communication from the attacker and confirmed access was no longer possible; fixed the vulnerability (completed 8/6); strengthened login authentication for the purchaser My Page (8/6); emailed affected purchasers (from 8/7); set up contact points for purchasers and shops. Purchasers and shops were asked to change passwords and use multi-factor authentication

What you should do

  1. Even the last 4 digits make a scam call sound genuine. Never give card details by phone or text
  2. Scammers who know your account number pose as refund staff. No bank or company asks for your PIN
  3. Change this password and every account that reused it now. Weak passwords crack even when hashed or encrypted. Switch to a passkey where offered
  4. Don't open links in emails from this company. The apology email itself may be fake
  5. Treat refund or apology calls and texts as scams. Call back only on the number from the official site
  6. Watch for unexpected mail or invoices; your address is hard to change
  7. Check the company's notice to see if you're affected

Lessons for companies

  1. Patch internet-facing servers, VPNs and admin panels first. Exploits follow disclosure within days
  2. Don't keep ID or bank data: delete after checks or use a KYC provider
  3. Report to the PPC: preliminary in 3–5 days, final in 30 (60 if malicious)
  4. Run red teaming and AI-assisted hardening, and publish how much you invest

Sources