CVE-2026-78208 json
exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename
published 2026-08-24 2 mo ago modified 2026-11-08 25 h ago also EUVD-2026-64683
- 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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).
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 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
-
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
Fencer Vulns 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.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.