> JapanHacked_
[Contained][Severity: Major][Intrusion]

Mandarake: unauthorized access to its servers

At about 23:00 on 27 August, Mandarake, which sells second-hand manga and collectibles, found unauthorized access to its servers and shut down the affected servers. Names, addresses, phone numbers and emails given by customers who ordered online up to 06:00 on 28 August may have leaked. It does not hold card data, and says member passwords and buyback member data did not leak. It stopped its online store and postponed its big auction.

Disclosed

2026-08-30

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

Timeline

  1. Detected 2026-08-27
  2. Disclosed 2026-08-30
  3. 3 days

Attack or cause

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

Data exposed or at risk

[Name][Postal address][Phone number][E-mail address]

Organizations involved

Open in organization search

Sources

  1. [1][Official]不正アクセスによる個人情報漏えいの可能性、通販サイトのサービス停止および「大オークション大会」開催延期のお知らせとお詫びMandarake
  2. [2][News]まんだらけ、不正アクセスで個人情報漏えいの恐れ 通販サイト停止で「大オークション大会」も延期にITmedia NEWS · 2026-09-01