CVE-2026-78208
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Weakness classification (CWE)
References
- github.com/exceljs/exceljs (product)
- github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-m8mg-8574-gm3m (third-party-advisory)
- github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/workbook.js (technical-description)
- github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js (technical-description)
- www.vulncheck.com/advisories/exceljs-through-path-traversal-via-unvalidated-add… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-78208?
- CVE-2026-78208 is a high-severity vulnerability, classified under External Control of File Name or Path. CVSS score: 7.5/10. Published 2026-08-24.
- How severe is CVE-2026-78208?
- High severity. CVSS v3 base score is 7.5 out of 10.