In multi-user mode (OpenID), the sync API endpoints (/sync/*) don't verify that the authenticated user owns or has access to the file being operated on. Any authenticated user can read, modify, and overwrite any other user's budget files by providing their file ID.
Missing authentication middleware in the ActualBudget server component allows any unauthenticated user to query the SimpleFIN and Pluggy.ai integration endpoints and read sensitive bank account balance and transaction information.
The GoCardless components in Actualbudget in are logging responses to STDOUT in a parsed format using console.logand console.debug (Which in this version of node is an alias for console.log). This is exposing sensitive information in log files including, but not limited to: Gocardless bearer tokens. Account IBAN and Bank Account numbers. PII of the account holder. Transaction details (Payee bank information, Recipient account numbers, Transaction IDs)…