INSPECTING ARCHIVED INTELLIGENCE (OUTDATED VERSION).
Bithumb Discloses Data Leak After Internal System Breach Incident
|
2026-10-28 12:42
HIGH
LOW
DATA BREACH
Executive Summary
AI-generated
South Korea's crypto exchange Bithumb is investigating a data leak caused by a hack of its internal mobile system earlier this week, with CoinTelegraph and Yonhap News Agency reporting the incident. The breach occurred on Tuesday and was disclosed to the Korea Internet & Security Agency and the Personal Information Protection Commission. Bithumb has notified 38,490 affected customers from Daishin Securities' roughly 38,490 affected customers, which is part of an estimated 100,000 reported data leak cases tied to earlier cyberattacks that hit at least 16 South Korean financial institutions on October 28. The attack appears to be a data leak tactic targeting the cryptocurrency industry and media outlets, with Bithumb's breach being one of three financial firm breaches reported that day.
Technical Mitigations AI-generated
• Reset credentials and API keys that may have been exposed, and review access logs for the affected accounts or integrations.
Intelligence Metadata
Actors / Malware / CVEs / Campaigns
Target & Sectors
KR
cryptocurrencycryptocurrency
mediamedia
Incident Timeline
October 28
Threat actors breached internal systems of Bithumb, a cryptocurrency exchange, resulting in the subsequent disclosure by Daishin Securities and Mirae Asset Global Investments.
Click on any entity below to view its context and source!
organisation
CryptoBriefing
CryptoBriefing
reports that, according to
Yonhap News Agency
,
Daishin Securities
and
Mirae Asset Global Investments
also disclosed hacking incidents on October 28.
organisation
Daishin Securities
CryptoBriefing
reports that, according to
Yonhap News Agency
,
Daishin Securities
and
Mirae Asset Global Investments
also disclosed hacking incidents on October 28.
organisation
Mirae Asset Global Investments
CryptoBriefing
reports that, according to
Yonhap News Agency
,
Daishin Securities
and
Mirae Asset Global Investments
also disclosed hacking incidents on October 28.
2026/10/28
Bithumb, a South Korean crypto exchange, is investigating the extent of a data leak caused by a hack of its internal mobile system.
Click on any entity below to view its context and source!
organisation
CoinTelegraph
CoinTelegraph reports:
South Korea’s crypto exchange Bithumb is investigating the extent of a data leak caused by a hack of its internal mobile system earlier this week, Yonhap News Agency reported Wednesday.
organisation
Yonhap News Agency
CoinTelegraph reports:
South Korea’s crypto exchange Bithumb is investigating the extent of a data leak caused by a hack of its internal mobile system earlier this week, Yonhap News Agency reported Wednesday.
organisation
the Korea Internet & Security Agency
Bithumb discovered the breach of its in-house mobile system — the platform used by employees to communicate internally — on Tuesday and notified the Korea Internet & Security Agency and the Personal Information Protection Commission that day, according to Yonhap, which cited industry sources.
organisation
the Personal Information Protection Commission
Bithumb discovered the breach of its in-house mobile system — the platform used by employees to communicate internally — on Tuesday and notified the Korea Internet & Security Agency and the Personal Information Protection Commission that day, according to Yonhap, which cited industry sources.
victims
38,490 affected customers
Add Daishin’s roughly 38,490 affected customers and the count of exposed records across the sector keeps climbing.
Tactical Metrics
Metrics
victims
38,490
Affected Customers
Click for context!
Add Daishin’s roughly 38,490 affected customers and the count of exposed records across the sector keeps climbing.
Intelligence Sources
Data Breaches
2026-10-28
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Incident Version History
CURRENT VERSION
Last Updated: 2026-10-29T12:11
Comprehensive Tactical Telemetry
Highly Correlated Entities
7x
organisation
Identified Entity
CoinTelegraph
entity
2x
industry
Targeted Sector
Cryptocurrency
sector
Contextual Telemetry
Context Block
7 METRICS
target region
Target Country
Korea, Republic of
country
tactic
Cyber Operation Type
Data Leak
tactic
general metric
Reported Leak Cases
100,000
reported leak cases
attribution
Attributing Entity
Yonhap
authority
timeline
Temporal Reference
October 28
date
general metric
Korean Financial Institutions
16
korean financial institutions
victims
Affected Customers
38,490
affected customers
Click on any entity below to view its context in the main text!
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