CVE-2026-78208 json
exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename
published 2mo ago modified 3d ago also EUVD-2026-64683 , GHSA-m8mg-8574-gm3m
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository mateocallec/exceljs-hardened. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 43%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm exceljs-hardened 5.0.0
Is CVE-2026-78208 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | exceljs-hardened | <=4.4.0 |
5.0.0 |
Affected products
- exceljs exceljs
Classification
- Weakness
-
- CWE-73 External Control of File Name or Path
References
-
github.com
/mateocallec/exceljs-hardened/security/advisories/GHSA-m8mg-8574-gm3m
third-party-advisory, vendor-advisory, advisory
-
github.com
/exceljs/exceljs
product
-
github.com
/exceljs/exceljs/blob/v4.4.0/lib/doc/workbook.js#L142-L147
technical-description
-
github.com
/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L421-L429
technical-description
-
vulncheck.com
/advisories/exceljs-through-path-traversal-via-unvalidated-addimage-filename
third-party-advisory
Sources
- CVE List CVE-2026-78208
- NVD CVE-2026-78208
- Maintainer advisory GHSA-m8mg-8574-gm3m
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of mateocallec/exceljs-hardened published their own advisory on GitHub. Reviewed sources take precedence over it.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.