A workbook is an Excel file that can contain multiple sheets, formulas, charts, pivot tables, and raw data. In business settings, workbooks often become working documents for budgets, forecasts, logs, and reports, which makes them important assets in security and governance.
Workbooks matter in cyber security because they can carry more than numbers. They may include macros, external data connections, hidden sheets, links to other files, and formulas that transform values into decisions. Attackers can abuse these features to deliver malicious content, hide data manipulation, or trick users into trusting altered results. Defenders therefore review workbook provenance, permissions, formula logic, and refresh sources. In tools that generate live report views from workbook data, the workbook remains the upstream source of truth, so stale, tampered, or over-privileged edits can affect every derived output.