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    CVE-2026-78209

    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.

    Published:Aug 24, 2026
    Last Modified:Aug 29, 2026
    EPS:Aug 24, 2026
    EPSS Score:0.00295
    CVSS Score:8.2

    Affected Products

    Vendor
    Exceljs
    Product
    Exceljs
    Vendor
    Exceljs Project
    Product
    Exceljs

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High