Vulnerability · Published Aug 24, 2026 · Assigned by VulnCheck
CVE-2026-78208exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename
High 7.5
In plain English
A high-severity security flaw in exceljs from exceljs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 56.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-73 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/exceljs/exceljs product
- GitHub Security Advisory (GHSA-m8mg-8574-gm3m) third-party-advisory
- https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/workbook.js#L142-L147 technical-description
- https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L421-L429 technical-description
- VulnCheck Advisory: exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename third-party-advisory