CVE-2026-78209EPSS p32.9%

CVE-2026-78209CVE-2026-78209

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.

Scoring

CVSS 8.2 ()
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
EPSS0.41% probability of exploitation · percentile 32.9% · 2026-10-05T12:00:23Z
Last modified2026-08-31
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.