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CVE-2026-78209 Details

UNDERGOING ENRICHMENT

The CVE is currently being enriched by the Volerion team. The enrichment process results in the association of reference link tags, CVSS, and CPE applicability statement data.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:…Vector:This vulnerability is currently being analyzed.

CNA: [email protected]CVSS-B:8.2 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/exceljs/exceljs	[email protected]
https://github.com/exceljs/exceljs/blob/v4.4.0/lib/csv/csv.js#L109-L182	[email protected]
https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-9wxc-4rhw-hfrw	[email protected]
https://www.vulncheck.com/advisories/exceljs-through-csv-formula-injection-via-unescaped-cell-values	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1236	Improper Neutralization of Formula Elements in a CSV File	[email protected]

Affected Products

This vulnerability is currently being analyzed

Change History

3 change records found show changes

Date	Action	Recorded By
Aug 29, 2026	CVE Modified	[email protected]
Aug 24, 2026	CVE Modified	CISA-ADP
Aug 24, 2026	New CVE Received	[email protected]