Block discloses data breach involving Cash App potentially impacting 8.2 million US customers

The security breach took place on December 10, 2021, the downloaded reports includes customers’ full names as well as their brokerage account number (the unique identification number associated with a customer’s stock activity on Cash App Investing), and for some customers also included brokerage portfolio value, brokerage portfolio holdings and/or stock trading activity for one trading day. Block pointed out that the reports don’t contain personally identifiable information such as usernames or passwords, Social Security numbers, dates of birth, payment card information, addresses, and bank account details.

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