> JapanHacked_
[Contained][Severity: Major][Credential abuse]

en: credential stuffing attack on the Middle no Tenshoku job site

On 5 June, en disclosed unauthorized access to its Middle no Tenshoku job site. Between 26 May and 2 June there were 2,503 logins with IDs and passwords apparently obtained elsewhere, detected on 2 June. Some members' account pages may have been accessed; passwords of all members were reset. No tampering was found.

Disclosed

2026-06-05

Organizations involved

1

Leaked or at risk

2.5K

2,503

Downtime

Unknown

Timeline

  1. Started 2026-05-26
  2. Detected 2026-06-02
  3. Disclosed 2026-06-05
  4. 10 days

Attack or cause

Method
[Credential abuse]
Impact
[Data leak]
Entry point
Stolen credentials

Data exposed or at risk

–

Services hit

Organizations involved

Open in organization search

Sources

  1. [1][Official]「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en · 2026-06-05