exceljs-hardened versions before 5.0.0 fail 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.
History

Mon, 24 Aug 2026 00:45:00 +0000

Type Values Removed Values Added
Description exceljs-hardened versions before 5.0.0 fail 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.
Title exceljs through 4.4.0 CSV Formula Injection via Unescaped Cell Values
First Time appeared Exceljs Project
Exceljs Project exceljs
Weaknesses CWE-1236
CPEs cpe:2.3:a:exceljs_project:exceljs:*:*:*:*:*:*:*:*
Vendors & Products Exceljs Project
Exceljs Project exceljs
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N'}

cvssV4_0

{'score': 8.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-24T00:30:48.493Z

Reserved: 2026-08-24T00:15:01.656Z

Link: CVE-2026-78209

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-24T01:16:58.423

Modified: 2026-08-24T01:16:58.423

Link: CVE-2026-78209

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-24T01:30:04Z