7.5highHigh
CVE-2026-78208
exceljs through 4.4.0 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.
What the metrics mean
- It is reachable over a network, without needing local access.
- For an attacker who can reach it, no special conditions are needed to exploit it.
- To exploit it, no account is needed.
- Beyond that, no action by a user is required.
Scoring
- CVSS
- 7.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N- CVSS v4
- 8.7
- Weakness
- CWE-73
- Assigned by
- disclosure@vulncheck.com
Dates
- Published
- 2026-08-24
- Last modified
- 2026-08-31
- Sources
- NVD
References
- https://github.com/exceljs/exceljs
- https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/workbook.js#L142-L147
- https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L421-L429
- https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-m8mg-8574-gm3m
- https://www.vulncheck.com/advisories/exceljs-through-path-traversal-via-unvalidated-addimage-filename