PT-2026-39189 · N8N-Mcp · N8N-Mcp
Fg0X0
·
Published
2026-05-08
·
Updated
2026-05-14
·
CVE-2026-44694
CVSS v3.1
9.1
Critical
| Vector | AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L |
Name of the Vulnerable Software and Affected Versions
n8n-MCP versions 2.18.7 through 2.50.1
Description
An authenticated server-side request forgery (SSRF) issue exists affecting the webhook trigger tools, the n8n API client
N8N API URL, and per-request URLs provided via the x-n8n-url header in multi-tenant HTTP mode. A caller with access to the MCP session can force the host to send HTTP requests to internal services and cloud metadata endpoints. This allows for internal-service enumeration and the theft of credentials, such as temporary IAM, GCP service account, or Azure managed-identity credentials. In single-tenant or stdio deployments, this can be triggered via indirect prompt injection where an attacker influences the LLM's tool calls to read internal services.Recommendations
Update n8n-MCP to version 2.50.2.
Restrict network egress from the host using a firewall or security group to deny access to cloud metadata IPs and unnecessary RFC1918 networks.
Run the software in stdio mode instead of HTTP if multi-tenant functionality is not required.
Disable workflow management tools by setting
DISABLED TOOLS=n8n trigger webhook workflow,n8n create workflow,n8n test workflow if they are not needed.Fix
Time Of Check To Time Of Use
SSRF
Found an issue in the description? Have something to add? Feel free to write us 👾
Related Identifiers
Affected Products
N8N-Mcp