> JapanHacked_
[Contained][Severity: Major][Web app exploit]

TeeTime Golf School Guide: applicant data possibly viewed in an intrusion

An intrusion into Golf School Guide may have exposed applicant and school information. No data removal or alteration has been confirmed.

Disclosed

2026-10-30

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

What happened

A system vulnerability was exploited to access the administration screen in August 2026. TeeTime learned of it in October and disclosed it on 30 October; it did not give exact incident or detection dates. [1]

Impact

Names, email addresses, phone numbers and other application data, along with some listed-school information, may have been viewed. Data removal and alteration have not been confirmed, and no count was published. [1]

Response

TeeTime blocked the access route, reported to the Personal Information Protection Commission and emailed affected users individually. It is implementing preventive measures. [1]

Timeline

  1. Disclosed 2026-10-30
  2. 1 days

Attack or cause

Method
[Web app exploit]
Impact
[Data leak]
Entry point
Web app

Data exposed or at risk

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

Services hit

Organizations involved

Sources

  1. [1][Official]「ゴルフスクールガイド」への不正アクセスに関するお詫びとお知らせTeeTime · 2026-10-30