CVE-2026-39974
- Source
- https://cve.org/CVERecord?id=CVE-2026-39974
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39974.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-39974
- Aliases
- Published
- 2026-04-09T16:45:20.490Z
- Modified
- 2026-07-08T08:12:32.922016582Z
- Severity
-
- 8.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N CVSS Calculator
- Summary
- n8n-MCP has an Authenticated SSRF via instance-URL header in multi-tenant HTTP mode
- Details
-
n8n-MCP is a Model Context Protocol (MCP) server that provides AI assistants with comprehensive access to n8n node documentation, properties, and operations. Prior to 2.47.4, an authenticated Server-Side Request Forgery in n8n-mcp allows a caller holding a valid AUTHTOKEN to cause the server to issue HTTP requests to arbitrary URLs supplied through multi-tenant HTTP headers. Response bodies are reflected back through JSON-RPC, so an attacker can read the contents of any URL the server can reach — including cloud instance metadata endpoints (AWS IMDS, GCP, Azure, Alibaba, Oracle), internal network services, and any other host the server process has network access to. The primary at-risk deployments are multi-tenant HTTP installations where more than one operator can present a valid AUTHTOKEN, or where a token is shared with less-trusted clients. Single-tenant stdio deployments and HTTP deployments without multi-tenant headers are not affected. This vulnerability is fixed in 2.47.4.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39974.json", "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-918" ] }- References
-
- https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.4
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39974.json
- https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-4ggg-h7ph-26qr
- https://nvd.nist.gov/vuln/detail/CVE-2026-39974
- https://github.com/czlonkowski/n8n-mcp/commit/d9d847f230923d96e0857ccecf3a4dedcc9b0096
Affected packages
Git / github.com/czlonkowski/n8n-mcp
Affected ranges
- Type
- GIT
- Repo
- https://github.com/czlonkowski/n8n-mcp
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
{ "source": [ "AFFECTED_FIELD", "CPE_RANGE", "REFERENCES" ], "cpe": "cpe:2.3:a:n8n-mcp:n8n-mcp:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "0" }, { "fixed": "2.47.4" } ] }