Is CVE-2026-39974 actively exploited?

No active exploitation of CVE-2026-39974 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-39974 be exploited remotely?

Yes. CVE-2026-39974 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-39974?

CVE-2026-39974 has a CVSS score of 8.5 (HIGH).

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HIGH

CVE-2026-39974

CWE-918Published: April 9, 2026· Updated: Apr 13, 2026

8.5

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.5th

Official Description

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 AUTH_TOKEN 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 AUTH_TOKEN, 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.

NVD Source

Technical Analysis

CVE-2026-39974 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 8.5.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.