{"url":"https://newsforagent.com/news/2026-10-28/bithumb-data-leak-internal-system-hack","markdown_url":"https://newsforagent.com/news/2026-10-28/bithumb-data-leak-internal-system-hack.md","title":"Bithumb Probes Data Leak After Internal System Hack","headline":"Bithumb Investigates Data Leak From Internal Mobile System Breach","description":"Bithumb is investigating a data leak from its internal mobile system after a hack, and says customer virtual assets are held on a separate trading platform.","section":"Incidents","published_at":"2026-10-28T02:56:30+00:00","modified_at":"2026-10-28T02:56:30+00:00","author":"News Desk","key_takeaways":["Bithumb discovered the breach of its in-house mobile system on Tuesday and notified the Korea Internet & Security Agency and the Personal Information Protection Commission that day.","Bithumb said its internal work system is separated from the virtual asset trading system, so customer virtual assets cannot be accessed through the breach.","Financial Supervisory Authority Governor Lee Chan-jin said cyberattacks had hit 16 South Korean financial firms as of October 14."],"companies":[{"name":"Bithumb","is_primary":true,"profile_url":"https://akta.pro/company-profiles/000053e/bithumb","website":"https://www.bithumb.com"}],"source":{"publisher":"Cointelegraph","title":"Bithumb Investigates Extent of Data Leak After Internal Hack","url":"https://ct.com/news/bithumb-discloses-data-leak-after-internal-system-breach-report"},"other_sources":[],"tags":["Incidents","Bithumb"],"body_markdown":"South Korea's crypto exchange [Bithumb](https://akta.pro/company-profiles/000053e/bithumb) is investigating the extent of a data leak caused by a hack of its internal mobile system, the platform employees use to communicate internally. [Cointelegraph](https://ct.com/news/bithumb-discloses-data-leak-after-internal-system-breach-report) reported the investigation on October 28, 2026, citing Yonhap News Agency.\n\n## Bithumb's Breach Discovery and Notifications\n\nBithumb found the breach on Tuesday and notified the Korea Internet & Security Agency and the Personal Information Protection Commission that day, according to Yonhap, which cited industry sources. The exchange is examining the scope of the attack, including whether member data was leaked.\n\n\"We are analyzing the exact scope, including the possibility of member information being involved,\" Bithumb told Yonhap. \"We will provide an official announcement this morning. However, the internal work system is separated from the virtual asset trading system, so customer virtual assets cannot be accessed through this breach.\"\n\nThe incident adds to a recent wave of cyberattacks in Korea's financial sector. At a meeting at the Financial Supervisory Authority headquarters on Wednesday, Governor Lee Chan-jin said cyberattacks had hit 16 South Korean financial firms as of October 14. The Korea Times reported that asset manager Mirae Asset Global Investments and Daishin Securities were also recent victims. Daishin Securities said personal and credit information belonging to 38,490 customers had been leaked, while Mirae Asset Global Investments said it had blocked abnormal external access to some web systems and was investigating, adding that investor information was not affected, according to Yonhap.\n\n## Bithumb's Scale in Korean Crypto Trading\n\nBithumb is South Korea's second-largest cryptocurrency exchange by trading volume, according to akta.pro [company records](https://akta.pro/company-data), holding approximately 24.8% to 30% market share among the five won-denominated exchanges. The same records describe Bithumb as operating spot trading in KRW and BTC markets and serving retail and institutional investors through its website, mobile apps and Bithumb BIZ corporate services. Bithumb was founded in 2015 and is headquartered in Seoul.\n\n## Earlier Bithumb Security and Listing Actions\n\nOn October 26, 2026, Upbit and Bithumb designated Initia (INIT) as a trading warning asset, citing security incidents including hacking attacks, Panewslab reported. Bithumb had earlier suspended deposits and withdrawals for Ontology (ONT), Ontology Gas (ONG) and MovieBloc (MBL) on October 11, 2026, because block production on the Ontology network had stopped, CoinMarketCap reported. On October 13, 2026, Upbit, Bithumb and Coinone added BLUR to their delisting watchlist, citing shortcomings in commercial viability and sustainability, CoinMarketCap reported.\n\n## Bithumb's Planned Official Announcement\n\nBithumb said it will provide an official announcement on the breach. The exchange has not given a date for that announcement.\n","publisher":{"name":"News for Agent","url":"https://newsforagent.com"}}