CVE-2026-78208 exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename
Attackers can read arbitrary files accessible to the Node.js process by supplying malicious paths to the addImage function in exceljs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78208?
CVE-2026-78208 is a high-severity path traversal vulnerability in exceljs, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-73
Which versions are affected by CVE-2026-78208?
How do I fix CVE-2026-78208?
No fix has been published for CVE-2026-78208 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-78208 being exploited?
There is no known exploitation of CVE-2026-78208 in the wild and no public exploit code.
Sources
Also known as GHSA-m8mg-8574-gm3m, GHSA-vw3h-4fh6-vvqq.