CVE-2026-78209

HighCVSS 8.2/10Last modified Oct 14, 2026

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 3.1 8.2/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Weakness enumeration

CWE-1236

Affected software

No affected versions have been published.

Timeline

Published: Aug 24, 2026
Last modified: Oct 14, 2026
NVD status: Deferred

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