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THREAT OPS › Threat News › [NVD] CVE-2026-78209 (HIGH 8.2) — 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 exfiltr

[NVD] CVE-2026-78209 (HIGH 8.2) — 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 exfiltr

mednvdPublished 2026-08-24

CVE-2026-78209 CVSS: 8.2 HIGH Published: 2026-08-24T01:16:58.423

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.

Indicators of compromise

CVE-2026-78209cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-78209