Investigating

en Japan Mid-Career: 2,503 credential-stuffing logins may have exposed member pages

Possible data leak: Unauthorized logins detected June 2, 2026. Between May 26 and June 2, credential stuffing produced 2,503 member-page logins; disclosed June 5. Passwords are hashed; no internal credential leak confirmed.

Last updated: 2026-11-09

Overview

Count stores 2,503 unauthorized logins.

Timeline

  1. Occurred
  2. Discovered
  3. Disclosed

Organization response

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

What you can do

Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.

Sources

  1. 「ミドルの転職」への不正アクセス発生に関するお詫びとご報告エン株式会社 · 2026-11-09

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