CVE-2026-78209exceljs through 4.4.0 CSV Formula Injection via Unescaped Cell Values
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
- Weakness (CWE)
- CWE-1236
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Aug 29, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
exceljs exceljs exceljs:exceljs (from the name) | through 4.4.0 | CNA record |
References
- https://github.com/exceljs/exceljsproduct
- https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-9wxc-4rhw-hfrwthird-party-advisory
- https://github.com/exceljs/exceljs/blob/v4.4.0/lib/csv/csv.js#L109-L182technical-description
- https://www.vulncheck.com/advisories/exceljs-through-csv-formula-injection-via-unescaped-cell-valuesthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.