Bithumb Investigates Data Breach After Internal System Hack
South Korea's Bithumb exchange is probing a cyberattack on its internal communications system and assessing potential data exposure.
South Korea's Bithumb exchange is probing a cyberattack on its internal communications system and assessing potential data exposure. This is an original Token Times brief synthesising 4 outlets (Crypto Economy, Blockonomi, Unchained, and others), plus live market data, as of Wed, 28 Oct 2026 12:00:01 UTC.
The incident raises concerns about user data security and highlights vulnerabilities in crypto exchange infrastructure, especially as multiple financial firms in South Korea report similar breaches on the same day.
- Bithumb Says Intruder Took Personal Data From Internal Employee App, Trading Unaffected ↗
- Bithumb Investigates Data Breach Following Cyberattack On Internal Groupware System ↗
- South Korean Crypto Exchange Bithumb Reports Internal System Breach ↗
- Bithumb Says Hackers Accessed Internal System, Leaking Personal Data ↗
- Bithumb's internal groupware system was breached by an external attacker.
- The exchange has reported the incident to South Korean authorities.
- Customer crypto assets remain secure as trading systems are separate.
- South Korea's second-largest exchange is still investigating potential data exposure.
Multiple outlets including Crypto Economy, Blockonomi, Unchained, and Decrypt confirm that Bithumb experienced a cyberattack on its internal communications system and has reported the incident to authorities. They agree that the exchange is investigating whether customer data was compromised, though trading systems remain secure. However, while Crypto Economy emphasizes the review of breach scope, Blockonomi and Decrypt specifically highlight that the incident occurred on Tuesday and was immediately reported to government agencies. Unchained adds context by noting that other South Korean financial firms also disclosed breaches on the same day.
South Korean cryptocurrency exchange Bithumb is investigating a significant data breach after an external attacker gained access to its internal groupware system. The incident was discovered on Tuesday, and the exchange has reported the breach to relevant government authorities, according to Blockonomi and Decrypt.
The breach has raised concerns about the potential exposure of sensitive information. Bithumb is currently reviewing the scope of the incident to determine whether any customer data was compromised. The exchange has assured users that their crypto assets remain secure, as the compromised internal system is separate from the trading platform.
This incident comes at a time when cybersecurity in the crypto industry is under heightened scrutiny. The breach follows a pattern of similar attacks on other financial institutions in South Korea, with Daishin Securities and Mirae Asset also reporting breaches on the same day, as noted by Unchained.
Bithumb, known as South Korea's second-largest crypto exchange, has faced previous security issues. In 2019, the exchange suffered a major hack that resulted in the loss of approximately $20 million in cryptocurrencies. The latest incident underscores the ongoing challenges exchanges face in protecting user data and maintaining robust security measures.
The broader crypto market remains relatively stable despite the news, with the total market cap at $2.79 trillion and 
Bitcoin up 1.73% over the past 24 hours. The Fear & Greed Index currently stands at 51, indicating a neutral market sentiment. This suggests that while the Bithumb breach is a significant concern, it has not yet had a major impact on overall market confidence.
The incident highlights the need for continuous improvement in cybersecurity practices within the crypto industry. As exchanges handle large volumes of sensitive data and assets, they must remain vigilant against evolving threats. Investors and users will be watching closely to see how Bithumb manages this situation and what measures it implements to prevent future breaches.
Bithumb Investigates Data Breach After Internal System Hack — questions & answers
What data was compromised in the Bithumb breach?
The extent of the data breach is still under investigation, but it is confirmed that an internal communications system was accessed. Customer crypto assets are secure as they are stored separately.
How did Bithumb respond to the cyberattack?
Bithumb reported the incident to South Korean authorities and is reviewing the breach's scope to determine if any customer data was exposed.
Are other financial institutions in South Korea affected?
Yes, Daishin Securities and Mirae Asset also reported breaches on the same day, indicating a wider cybersecurity issue in the region.
Which outlets reported this story?
This is an original Token Times brief that synthesises reporting from Crypto Economy, Blockonomi, Unchained, Decrypt, with the key figures cross-checked for agreement across them. It is not a copy of any one article — follow the source links above for the original reporting.
Original summary — not financial advice. This is an original Token Times brief that summarises a development reported elsewhere and adds live market data for context; it is not the original article and reproduces no part of it. Follow the source link above for full details. Crypto is volatile and high-risk — always do your own research.