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

G-Plan: unauthorized access to the G-Point system

On 25 September, G-Plan, a BIGLOBE subsidiary, detected anomalies in the system of its G-Point points service and found it had been accessed from outside. It shut the system down the same day, stopping G-Point related services. Up to about 70,000 member identifiers may have leaked. The cause and scope are under investigation and no restart date has been set.

Disclosed

2026-09-30

Organizations involved

1

Leaked or at risk

70K

70,000

Downtime

Unknown

Timeline

  1. Detected 2026-09-25
  2. Disclosed 2026-09-30
  3. 5 days

Attack or cause

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

Data exposed or at risk

–

Services hit

Organizations involved

Open in organization search

Sources

  1. [1][Official]「Gポイント」システムへの不正アクセス発生についてG-Plan · 2026-09-30
  2. [2][Official]【重要】不正アクセスによる「Gポイント」サービス一時停止のお知らせとお詫びG-Plan · 2026-09-30
  3. [3][News]「Gポイント」不正アクセスで一時停止 「会員識別子」約7万件漏えいか KDDI不正会計問題のジー・プランが運営ITmedia NEWS · 2026-10-01