CVE-2026-128347

HIGH 7.5

ExcelJS through 4.4.0 Arbitrary File Read via WorkbookWriter addImage Filename

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

ExcelJS through 4.4.0 contains an arbitrary file read vulnerability in the streaming WorkbookWriter that allows attackers to read local files by supplying crafted image filenames to addImage. Attackers can inject ../ path segments into user-controlled image paths, causing addMedia to embed any file readable by the Node.js process under xl/media in the generated workbook.

CWE	CWE-73
Vendor	exceljs
Product	exceljs
Published	Nov 13, 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-f9m8-8qmf-qq29 github.com: https://github.com/exceljs/exceljs/blob/v4.4.0/lib/stream/xlsx/workbook-writer.js#L230-L237 github.com: https://github.com/exceljs/exceljs/blob/v4.4.0/lib/stream/xlsx/workbook-writer.js#L124-L130 vulncheck.com: https://www.vulncheck.com/advisories/exceljs-through-4.4.0-arbitrary-file-read-via-workbookwriter-addimage-filename

Credits

Matéo Florian Callec