TLDR
- Coinbase said a security incident at analytics vendor Amplitude exposed some customers’ contact information.
- The exchange said a “small subset” of its customers was affected, along with other Amplitude clients.
- Coinbase denied any breach of its own systems and said customer funds were not affected.
- South Korea’s Bithumb and Daishin Securities also reported data security issues on the same day.
- Coinbase previously disclosed a separate breach in May 2025, with costs estimated at up to $400 million.
Coinbase said on Wednesday that some of its customers’ contact information was exposed in a security incident at Amplitude, an analytics vendor the exchange works with.
The crypto exchange said the problem happened at the vendor, not inside its own platform. It found no evidence that anyone gained unauthorized access to Coinbase systems.
What Coinbase Said About the Amplitude Incident
Coinbase Support shared the news in a post on X. The team said the incident affected a “small subset” of Coinbase customers.
Coinbase was not the only company involved. Other Amplitude clients were also affected by the same incident.
The exchange said the exposed data was contact information. It also said customer funds were not affected.
Coinbase did not say how many users were impacted. Cointelegraph asked the company for that number but had not received a reply by the time of publication.
Amplitude provides analytics tools that help companies track how people use their apps and websites. Companies often share some user data with outside vendors to run these kinds of services.
Other Data Breaches Reported on the Same Day
The Coinbase disclosure came on the same day as several other security reports from crypto exchanges and traditional financial firms.
In South Korea, crypto exchange Bithumb is investigating a possible breach. The company is checking whether an attack on its internal work platform exposed customer information.
Also in South Korea, brokerage Daishin Securities reported a data leak. The firm said personal and credit information belonging to 38,490 customers was exposed.
The reports did not say whether any of these incidents were connected to each other.
This is not the first time Coinbase has dealt with a data breach. In May 2025, the exchange disclosed a separate incident that affected less than 1% of its monthly transacting users.
In that case, criminals stole customer data and demanded a $20 million ransom. Coinbase refused to pay.
The exchange estimated that reimbursement and remediation costs from that breach could reach up to $400 million.
For now, Coinbase says its own systems were not breached and customer funds are safe. The company has not yet shared how many customers were affected by the Amplitude incident.
