SignalTalk security incident history
Hacking, data breaches and other security incidents involving SignalTalk, with related coverage.
Incidents: 1 · Most recent
Maru-Jan leak exposes emails and passwords of all 1,855,578 members
1.9mImpact: Passwords and registered email addresses of all 1,855,578 members leaked
The passwords and registered email addresses of all 1,855,578 members of Maru-Jan, an online mahjong service operated by Japan’s SignalTalk, were downloaded externally. The attacker exploited a function in the administration system. Following emergency maintenance and the blocking of the intrusion route, the operator resumed the service on 7 November 2026 and asked members to change their passwords.
Related reports: 12 · last report →