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csv-formula-injection

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CSV/spreadsheet formula injection (DDE, Excel/LibreOffice, Google Sheets IMPORT*). Use when exports, imports, or user fields feed spreadsheets or reporting tools.

skills/csv-formula-injection/SKILL.md

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Sep 13, 2026
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# SKILL: CSV Formula Injection

> **AI LOAD INSTRUCTION**: This skill covers formula/DDE-style injection in CSV and spreadsheet contexts, obfuscation, cloud-sheet primitives, and safe testing methodology. Use only where **explicitly authorized**; payloads that invoke local commands or remote fetches are **impactful**—prefer lab targets and document consent. Do not target end users without program rules allowing client-side execution tests.

## 0. QUICK START

Characters that may trigger formula evaluation when a cell is opened in Excel, LibreOffice Calc, or similar (often only if the cell is interpreted as a formula):

```text
=
+
-
@
```
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