> JapanHacked_
[Resolved][Severity: Critical][Intrusion]

Lawson: unauthorized access to Lawson ID and Lawson app pre-orders

Lawson found on 7 October that Lawson ID had been accessed without authorization from 12 to 14 September and Lawson app pre-orders on 17 September. Email addresses and names of 2,155,345 Lawson ID records leaked, plus gender, phone numbers and addresses where users had entered them. For pre-orders, names, phone numbers and partial card numbers of 26 records leaked. The access went through the mechanism that shows users their own data in the app. All app reservation functions resumed on October 19 after security measures.

Disclosed

2026-10-08

Organizations involved

1

Leaked or at risk

2.2M

2,155,345

Downtime

Unknown

Timeline

  1. Started 2026-09-12
  2. Detected 2026-10-07
  3. Disclosed 2026-10-08
  4. Resolved 2026-10-19
  5. 37 days

Attack or cause

Method
[Intrusion]
Impact
[Data leak]
Entry point
Unknown

Data exposed or at risk

[E-mail address][Name][Gender][Phone number][Postal address][Payment card]

Services hit

Organizations involved

Open in organization search

Sources

  1. [1][Official]第三者による不正アクセスに伴う個人情報漏えいに関するお詫びとお知らせLawson
  2. [2][News]ローソン、215万件の個人情報漏えい 「ユーザー本人に情報を表示する機構」に不正アクセスITmedia NEWS · 2026-10-09
  3. [3][Official]ローソンアプリ予約の利用再開についてLawson · 2026-10-19