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Nikkei Says 17,000 Impacted by Data Breach Stemming From Slack Account Hack

Posted on November 5, 2025November 5, 2025 By CWS

Japanese media big Nikkei on Tuesday reported that hackers had gained entry to worker Slack accounts, stealing data pertaining to hundreds of people.

Nikkei, which is finest identified for main monetary publications corresponding to The Nikkei and Monetary Instances, mentioned the incident concerned malware stealing Slack credentials from an worker’s private pc. 

The credentials had been then used to entry worker Slack accounts, which enabled the attacker to steal data pertaining to workers and enterprise companions. 

An investigation confirmed that names, e mail addresses and chat histories belonging to over 17,000 of Nikkei’s Slack customers had been compromised.

“No leakage of knowledge associated to sources or reporting actions has been confirmed,” the corporate clarified.

The hack was found in September and passwords have been modified as a part of the corporate’s incident response procedures. 

Nikkei famous that whereas the kind of compromised data didn’t require it to reveal the info breach to authorities, it determined to voluntarily report the incident to Japan’s Private Info Safety Fee.

Infostealer malware has been identified to gather Slack credentials from contaminated units. Hudson Rock, which carefully screens infostealer exercise, reviews that the sort of malware has compromised greater than 270,000 Slack credentials.Commercial. Scroll to proceed studying.

This isn’t the one information breach disclosed by Nikkei lately. In 2022, the corporate was focused in a ransomware assault that impacted buyer data.

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Security Week News Tags:Account, Breach, Data, Hack, Impacted, Nikkei, Slack, Stemming

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