AdeccoFreelance SES matching service

2LowInvestigatingAnnounced

On February 5, 2026, Adecco reported unauthorized access to a mail account of its freelance matching service, which sent spam emails at random.

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
Email account compromise
Operational impact
Some services stopped

Sources

  1. 【重要】弊社メールアカウントへの不正アクセスによるスパムメール送信に関するお詫びと注意喚起www.adeccogroup.jp · Published 2026-02-05(opens in a new tab)