CVE-2026-15521 makafeli n8n-workflow-builder update_node_from_file server.cjs path traversal
A local attacker can exploit a path traversal vulnerability in the n8n-workflow-builder library to read or modify arbitrary files via the update_node_from_file function.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15521?
CVE-2026-15521 is a medium-severity path traversal vulnerability in makafeli n8n-workflow-builder, published on 13 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was identified in makafeli n8n-workflow-builder up to 0.11.0. Affected is an unknown function of the file build/server.cjs of the component update_node_from_file. The manipulation of the argument filePath leads to path traversal. An attack has to be approached locally. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.
Weakness: CWE-22
Which versions are affected by CVE-2026-15521?
How do I fix CVE-2026-15521?
No fix has been published for CVE-2026-15521 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-2026-15521 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15521 exists.
Sources
Also known as GHSA-pjp8-f5mg-f25p.