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

Nikkei: unauthorized access to its Slack

Credentials exposed by malware on an employee's personal PC were believed to enable Slack access. The company identified the incident in September and changed passwords. Its November 4 notice identified possible exposure of names, email addresses and chat histories for 17,368 people. Leakage of reporting sources or reporting-related information was not confirmed.

Disclosed

2025-11-04

Organizations involved

1

Leaked or at risk

17.4K

17,368

Downtime

Unknown

Timeline

  1. Disclosed 2025-11-04
  2. 1 days

Attack or cause

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

Data exposed or at risk

[Name][E-mail address]

Organizations involved

Open in organization search

Sources

  1. [1][Official]業務用チャット・スラックへの不正ログインと情報流出についてNikkei Inc. · 2025-11-04