株式会社マイナビ

Mynavi says a cloud-service breach may have exposed 111,505 user, client and employee records

In a third report on 31 March, Mynavi said it detected an anomaly on 5 December 2025 in a cloud service it uses and immediately blocked external access, and that on 16 January 2026 it confirmed unauthorized third-party access may have caused some personal data of general users, corporate contacts, and company and group employees to leak .