CVE-2026-78208

HIGH 7.5

exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

exceljs-hardened before 5.0.0 contains a path traversal vulnerability in the Workbook.addImage() function that fails to validate file paths. Attackers can supply arbitrary file paths to read any file accessible to the Node.js process and embed it in the generated workbook.

CWE	CWE-73
Vendor	exceljs
Product	exceljs
Published	Aug 24, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

exceljs / exceljs

0 ≤ 4.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/exceljs/exceljs github.com: https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-m8mg-8574-gm3m github.com: https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/workbook.js#L142-L147 github.com: https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L421-L429 vulncheck.com: https://www.vulncheck.com/advisories/exceljs-through-path-traversal-via-unvalidated-addimage-filename

Credits

Matéo Florian Callec