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South Korean cryptocurrency exchange Bithumb has reported a breach of its internal mobile system, which employees use for work and communication. The attackers gained access to personal information, but preliminary reports indicate that customer funds were not affected.
Bithumb, South Korea's second-largest cryptocurrency exchange by trading volume, detected the unauthorized intrusion on October 27. The company reported the incident to the Korea Internet & Security Agency (KISA) and the Personal Information Protection Commission (PIPC).
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Exchange representatives told Yonhap News Agency that specialists were investigating the extent of the data breach, including whether hackers may have gained access to customer information.
Bithumb emphasized that the compromised system operates separately from its trading platform. As a result, attackers cannot access customers' cryptocurrency assets through the breached system.
The exchange has not yet disclosed how many people were affected by the data breach or whether the incident disrupted deposits and withdrawals.
Cyberattacks on financial firms increase in South Korea
Bithumb was one of three financial institutions whose security incidents came under investigation by South Korea's Financial Supervisory Service (FSS) on October 28.
Brokerage firm Daishin Securities reported that an external cyberattack had exposed the personal and credit information of 38,490 customers. Meanwhile, Mirae Asset Global Investments detected suspicious activity across several of its web systems but managed to block unauthorized access. According to the company, investor information was not compromised.
FSS Governor Lee Chan-jin said during a meeting with bank holding company executives that several major investment firms had suffered cyberattacks on October 27.
The regulator had previously reported that 16 South Korean financial institutions had been targeted by cyberattacks as of October 14.
This is not Bithumb's first major internal systems incident in 2026. In February, the exchange mistakenly credited customers with 620,000 BTC instead of 620,000 South Korean won. At the time, the mistakenly credited Bitcoin was worth more than $40 billion.
Bithumb CEO Lee Jae-won acknowledged that weaknesses in internal controls had caused the error. He said the company was fully aware of the serious shortcomings in its internal operational controls.
Biggest crypto hacks of 2026
The cryptocurrency industry has faced a series of major cyberattacks in 2026. One of the largest incidents was the September hack of Bitget, which reportedly resulted in the theft of approximately $387.5 million, according to industry sources. That same month, Liquid Network was attacked, with initial losses estimated at around $319 million, although a significant portion of the funds was subsequently recovered. In April, hackers stole approximately $292 million from the Kelp DAO protocol and another $285 million from the DeFi platform Drift Protocol. Security researchers linked the latter two attacks to North Korean hackers.
Statistics from blockchain security firm CertiK highlight the scale of the problem. According to its data, the crypto industry lost more than $1.31 billion across 344 security incidents in the first half of 2026 alone. Wallet compromise attacks caused the greatest financial damage, accounting for more than $444 million in losses. Phishing attacks resulted in another $366 million in losses. Analysts note that attackers are increasingly relying on social engineering and stolen credentials rather than exclusively exploiting technical vulnerabilities in blockchain protocols.
As a reminder, Qubic restarted its blockchain following a hack.
This material may contain third-party opinions, none of the data and information on this webpage constitutes investment advice according to our Disclaimer. While we adhere to strict Editorial Integrity, this post may contain references to products from our partners.
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