Coinbase and Bithumb Users Affected by Recent Data Leaks
Recent security incidents have led to data leaks affecting users of Coinbase and Bithumb, with both companies facing scrutiny over the breaches. Coinbase has confirmed that a security incident at its analytics vendor, Amplitude, exposed contact information for a small subset of its customers. The exchange emphasized that there is no evidence of a breach within its own systems and that customer funds remain secure.
In a statement, Coinbase clarified that the incident involved only a minor portion of its user base, though it did not specify the exact number of affected customers. Users have been advised to remain vigilant for any suspicious communications.
Simultaneously, Bithumb is investigating a potential breach of its internal mobile groupware systems, which may have resulted in the exposure of personal information for an unspecified number of its users. This incident coincides with reports of a data breach at Daishin Securities in South Korea, where nearly 38,500 customers had their credit card and personal details leaked.
The recent spate of breaches highlights a growing trend of cyberattacks targeting both cryptocurrency exchanges and traditional financial institutions. In light of these incidents, the South Korean presidential office convened an emergency meeting to address the situation.
Updated 18:02 UTC
New Facts on Crypto Hacks in 2026
- Crypto hacks have resulted in approximately $2.35 billion in net losses in 2026, with September alone accounting for about $768 million.
- The largest single loss occurred on September 24, when Bitget was drained of roughly $387.5 million.
- Liquid Network suffered a loss of about $320 million due to an inflation bug, with 3,400 BTC returned after negotiations.
- Drift Protocol experienced a governance and multisig compromise, losing approximately $285–296 million, attributed to North Korean actors.
- KelpDAO's rsETH bridge was drained of around $292 million, with preliminary indicators pointing to DPRK's Lazarus Group involvement.
- AI-assisted attacks have been noted as a growing threat, with models like GPT-5.3-Codex and Claude Opus 4.6 facilitating the discovery of vulnerabilities.
- Hardware wallet incidents, while significant, remain below the scale of CEX and DeFi losses, with Coinkite and Ledger losses estimated at $100–130 million and $86–102 million respectively.
- Industry leaders are advocating for updates to self-custody recommendations, promoting multivendor multisig wallets as a safer option.
Updated 18:02 UTC
Recent Developments on Data Leaks
Bithumb is currently investigating a data leak following a hack of its internal mobile work system, which was discovered on Tuesday. The exchange has notified the Korea Internet & Security Agency and the Personal Information Protection Commission about the breach.
While Bithumb has assured users that the compromised internal system is separate from its trading platform, the exact extent of the data leak, including whether customer information was exposed, remains under analysis. An official announcement is expected soon.
This incident is part of a larger trend of cyberattacks affecting South Korea's financial sector, with 16 firms reported as targets as of October 14. Recent victims include Daishin Securities, which experienced a leak of personal and credit information for 38,490 customers, and Mirae Asset Global Investments, which is investigating abnormal external access to its web systems.
FAQ
What happened to Coinbase users?
A security incident at Coinbase's analytics vendor, Amplitude, exposed contact information for a small subset of its customers. However, Coinbase confirmed that there was no breach within its own systems and customer funds remain secure.
How many Coinbase users were affected by the data leak?
Coinbase has not specified the exact number of affected customers, but it emphasized that the incident involved only a minor portion of its user base.
What is Bithumb investigating?
Bithumb is investigating a potential breach of its internal mobile groupware systems, which may have resulted in the exposure of personal information for an unspecified number of its users.
Are customer funds safe in Coinbase and Bithumb?
Yes, both Coinbase and Bithumb have stated that customer funds remain secure despite the recent data leaks.
What actions are being taken in response to these data breaches?
In response to the recent breaches, the South Korean presidential office convened an emergency meeting to address the situation and discuss measures to enhance security.
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