Sales vouchers are finance records that document a sale, payment, or credit adjustment. They may include amounts, customer references, approvals, invoice numbers, and accounting codes. In some organizations, they are part of the audit trail that proves a transaction was authorized and recorded correctly.
In cyber security, sales vouchers matter because they can reveal how money moves through a business and who has authority to approve it. Attackers may steal them during data theft or extortion to pressure a victim with sensitive financial detail, impersonate staff in fraud schemes, or map internal processes. Defenders protect them with access control, logging, encryption, and retention limits so that only authorized users can view or export these records.