CVE-2026-78209
HIGH
NVD
CVSS Score
8.2
Severity
HIGH
Published
Aug 24, 2026
Vendor
unknown
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.