Bithumb hack exposes data of 844 customers, exchange confirms
Bithumb hack affects 844 customers
Hack details
Bithumb's internal system was breached on October 27 1. An unauthorized external party gained access to Dow Office. It is its internal mobile groupware system 1. The company disclosed the scale of customer information exposed 1. A formal apology was issued 1.
Following the incident, CEO Lee Jae-won expressed regret for causing concern and anxiety among customers 1. Employees' use of a work platform led to the leak 1. Bithumb said 6,444 customers were affected in total 1. Of those, 844 had personal information exposed 1.
The leaked data included names, mobile phone numbers, and email addresses 1. Resident registration numbers, driver’s license numbers, and bank account numbers were also exposed 1. Copies of identification cards were leaked as well 1. The scope of the exposed information varied by customer 1.
Bithumb hack affects customers
Breach impact
Recently, Bithumb disclosed the scale of customer information exposed in a recent hacking incident 1. The company said 6,444 customers were affected in total 1. Of those, 844 had personal information exposed 1. This included names, mobile phone numbers, and email addresses 1.
An unauthorized external party gained access to Dow Office 1. The leaked data included resident registration numbers, driver’s license numbers, and bank account numbers 1. He apologized for causing concern and anxiety among customers 1. If secondary damage is confirmed, relief and compensation will be provided 1.
Meanwhile, the company found no signs of their trading infrastructure and user database being compromised 2. 715 Bithumb employees and staff from partner organizations were also affected by the breach 2. Generally, the specific data leaked varied among clients 2. They are taking steps to prevent a recurrence 1. They will reexamine the security of its internal business infrastructure 1.
Company response
Notifications will be sent to affected customers 1. Bithumb begins notifying 6,444 affected customers individually 1. He expressed regret for causing concern 1.
Relief and compensation are planned 1. If secondary damage is confirmed, Bithumb said it would provide relief and compensation 1. Focus will shift to preventing a recurrence 1. Lee Jae-won said they would do their best 1.
Policymakers note that the company will review internal security 1. The compromised groupware platform was an internal business system 1. No signs have been found that the exchange’s services or customer database were directly breached 1. Bithumb said 844 customers had personal information exposed 1.
Industry context
Other companies were also hacked, including Daishin Securities and Mirae Asset Global Investments 3. These firms have been targeted in a wave of attacks on financial institutions. Bithumb initially reported a data breach in its in-house mobile system 3. The incident was initially believed to have affected only its employees.
Daishin Securities and Mirae Asset were affected by the cyberattacks, along with Bithumb 3. The Korean aerospace and defense manufacturer's third quarter operating profit dropped 3. Samsung SDI reported a 342.2 billion won third quarter net profit 3. This profit was due to U.S. energy storage system battery orders.
Cyberattacks are a growing concern, with multiple firms being targeted 3. Bithumb found that personal information of hundreds of customers has been exposed 3. The company initially said only employee data was breached 3. Industry sources confirmed the leak of customer information 3.
Customer protection
Customers can check on the website if their personal information was exposed 1. Notifications to affected customers will start individually 1. A total of 6,444 customers were affected, with 844 having personal information exposed 1. The CEO expressed regret for the incident 1.
According to Bithumb, the leaked data included names, mobile phone numbers, and email addresses 1. The leak occurred when employees used a work platform 1. The compromised platform was an internal business system separate from customer exchange accounts 2. No signs have been found that the exchange's services or customer database were directly breached 2.
The Fed reported that Bithumb's security team noticed suspicious activity and began blocking access 2. Afterwards, the team then completely shut down the system and started identifying and fixing vulnerabilities 2. It was found that the attacker copied files containing information on 6,444 clients 2. Fortunately, data for 5,600 of them was encrypted and remained unreadable, according to Bithumb 2.
Frequently asked questions
What happened?
Bithumb's system was breached 1.
How many customers were affected?
6,444 customers 1.
What is Bithumb doing?
Company is investigating and apologizing 1.
About this article
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- bloomingbit: Bithumb Says 6,444 Customers Were Affected by Data Leak, 844 Had Personal Information Exposed · Oct 29, 2026 ET
- ForkLog: Bithumb Confirms Data Breach Affecting 844 Customers · Oct 29, 2026 ET
- Korea JoongAng Daily: Bithumb says personal information of hundreds of customers leaked in recent hack · Oct 29, 2026 ET
