UPSIDER

2LowInvestigatingAnnounced

UPSIDER was accessed without authorization through malicious code planted in open-source software it uses. The service was partly suspended.

This incident was imported from a dataset that compiles public announcements, and we are still checking it against the sources. Counts and causes will be updated after the check. Sources are in Japanese.

Cause
Via a vendor or service
Sector
Finance & insurance
Operational impact
Some services stopped

Sources

  1. 【続報】2026年4月1日のシステム障害に関する調査結果および第三者による不正アクセスの発生についてのご報告corp.up-sider.com · Published 2026-04-10(opens in a new tab)