Genron: up to about 800 registered-name records exposed on web Genron
Specific actions could reveal up to about 800 registered-name records on web Genron. Actual extraction is unconfirmed; affected functions are stopped for fixes.
Disclosed
2026-11-04
Organizations involved
1
Leaked or at risk
800
800
Downtime
Unknown
Affected scope
For some users who posted, commented or reacted in Tomonokai Lounge and other web Genron functions from March 2024 onward, specific actions could reveal registered names distinct from display names. Up to about 800 records are affected. No impact on other fields or actual outside extraction is confirmed. The notice does not attribute the issue to an attack. [1]
Affected services are stopped for repairs and safety checks. Genron Shop and Shirasu are outside this incident’s scope. [1]
Timeline
- Disclosed 2026-11-04
- 1 days
Attack or cause
- Method
- [Unknown]
- Impact
- [Data leak][Service outage]
- Entry point
- Web app
Data exposed or at risk
Services hit
Organizations involved
[Breached][Moderate]Tokyo, ShinagawaInformation and communications800 leaked
Genron Co., Ltd.
Sources
- [1][Official]友の会ラウンジ等「webゲンロン」一部利用者の氏名が閲覧可能となっていたことに関するお詫びとお知らせGenron · 2026-11-04