Coinbase and Bithumb users hit by data leaks

Dextape brief

By Dextape Desk · October 29, 2026

Personal data belonging to Bithumb and Coinbase users has leaked after hackers targeted the South Korean exchange and Coinbase's analytics vendor, Amplitude. An outside party reportedly breached Bithumb's internal mobile groupware systems, though the number of affected users was not specified. Amplitude's security incident exposed contact data for a small subset of Coinbase customers, along with customers of other Amplitude clients. Coinbase said its own systems were not accessed and customer funds were not affected.

Separately, Daishin Securities reportedly saw credit card and personal details of nearly 38,500 customers leaked, while Mirae Asset Global Investments' customer details reportedly did not appear to be exposed. Ransomware group WhiteArmor also reportedly leaked three months of customer data from Monero swap firm Wagyu, which refused a $5 million ransom.

Why it matters: Repeated data leaks at major exchanges expose personal details and contact information of users, raising concerns about third-party vendor security across crypto platforms.

Mentioned: Monero, Coinbase

Summary by Dextape, based on reporting by Protos. Written with AI from the publisher’s text and checked automatically for copied wording and unsupported figures. Not investment advice.