Nikkei Inc. hit by network compromise
Incident
Summary
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Nikkei Inc. disclosed a Slack account compromise that exposed internal chat histories and account data for 17,368 registered users. The intrusion followed the theft of Slack authentication credentials from an employee's infected personal computer and an unauthorized external login to the workspace. The incident was identified in September, and the company said it changed passwords to contain the breach. The compromise matters because it gave attackers access to employee accounts and internal communications.
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Nikkei Inc. Slack data leak exposing 17,368 users' names, email addresses, and chat histories
Data Leak
First: 06.11.2025 00:16
Last: 06.11.2025 00:16
Sources 1
How related:
"Potentially leaked information includes the names, email addresses, and chat histories for 17,368 individuals registered on Slack," Nikkei said in a statement.
About this happening:
**Nikkei Inc.** disclosed a **Slack data leak** affecting **17,368** registered users, exposing names, email addresses, and chat histories. The leak followed an **unauthorized ext...
Nikkei Inc. Slack data leak exposing 17,368 users' names, email addresses, and chat histories
Data LeakHow related: "Potentially leaked information includes the names, email addresses, and chat histories for 17,368 individuals registered on Slack," Nikkei said in a statement.
About this happening: **Nikkei Inc.** disclosed a **Slack data leak** affecting **17,368** registered users, exposing names, email addresses, and chat histories. The leak followed an **unauthorized ext...
Timeline
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06.11.2025 00:16 3 articles · 6mo ago
Nikkei Inc. discloses Slack breach
Initial DisclosureNikkei Inc. disclosed a Slack breach that exposed data and chat histories for 17,368 Slack users after an unauthorized external login to its Slack workspace, and said it voluntarily reported the matter to the Personal Information Protection Commission. The company said an employee's personal computer was infected with a virus that leaked Slack authentication credentials, that the incident had been identified in September, and that countermeasures such as changing passwords were implemented.
Show sources
- Nikkei Suffers Breach Via Slack Compromise — www.darkreading.com — 06.11.2025 00:16
- Nikkei Suffers Breach Via Slack Compromise — www.darkreading.com — 06.11.2025 00:16
- Media giant Nikkei reports data breach impacting 17,000 people — www.bleepingcomputer.com — 04.11.2025 18:28