[Contained][Severity: Critical][Intrusion]

Yakiniku King: app member data leaked

The member system of Monogatari's Yakiniku King app was accessed without authorization. Member numbers, names, e-mail addresses and phone numbers of 10,788,963 of its 10,808,784 users, nearly all of them, leaked.

Disclosed

2026-10-05

Organizations involved

Leaked or at risk

10.8M

10,788,963

Downtime

Unknown

Timeline

Started, Detected 2026-10-02
Disclosed 2026-10-05
3 days

Attack or cause

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

Data exposed or at risk

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

Organizations involved

[Breached][Critical]Aichi, ToyohashiAccommodation, food and drink10,788,963 leaked
The Monogatari Corporation

						Note
The Monogatari Corporation	[Breached]	[Critical]	Aichi, Toyohashi	Accommodation, food and drink	10,788,963

Open in organization search

Sources

[1][News]「焼肉きんぐ」個人情報約1079万件が漏えい　公式アプリのシステムに不正アクセスITmedia NEWS · 2026-10-05
[2][News]「焼肉きんぐ」、顧客情報漏洩　不正アクセスで1000万件超Nikkei · 2026-10-05