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CSV injection and formula hijacking: what viewers should avoid executing

Cells beginning with =, +, -, @ can trigger spreadsheet formulas, awareness for security teams and CSV tooling.

Опубликовано 21 марта 2025 г. · Table

When CSV opens in Excel or Sheets, a cell like =cmd|... can be interpreted as a formula. Pure viewers that do not execute formulas reduce that class of risk compared to full spreadsheet apps.

Defenses

  • Strip or prefix risky leading characters in untrusted feeds.
  • Open unknown files in a sandboxed viewer first.
  • Train finance users on "enable content" prompts.

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