Description
exceljs through 4.4.0 fails to neutralize leading equals, plus, minus, or at signs in cell values written to CSV output. Attackers who can influence exported cell values can inject formulas that execute when the CSV file is opened in a spreadsheet application, potentially exfiltrating data or performing other malicious actions.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| exceljs | exceljs | ≤ 4.4.0 | — |
References
- https://github.com/exceljs/exceljs product
- GitHub Security Advisory (GHSA-9wxc-4rhw-hfrw) third-party-advisory vendor-advisory
- https://github.com/exceljs/exceljs/blob/v4.4.0/lib/csv/csv.js#L109-L182 technical-description
- VulnCheck Advisory: exceljs through 4.4.0 CSV Formula Injection via Unescaped Cell Values third-party-advisory