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CVE-2026-45707

📛 CVE Title

(no title)

⬇ Download JSON ⚠ View as Threat

Description

n8n-MCP: Multi-tenant MCP requests fall back to process-level n8n credentials when tenant headers are absent or incomplete

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2026-45707 on 2026-07-17. Shown when MITRE's text differs from the cvelistV5 mirror.

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.2, when ENABLE_MULTI_TENANT=true, the HTTP transport documents that the target n8n instance is selected per-request from x-n8n-url / x-n8n-key headers. Requests that omitted those headers — or supplied only one of them — silently fell back to the process-level N8N_API_URL / N8N_API_KEY credentials configured for the operator's own n8n instance. As a result, an authenticated MCP tenant could cause n8n management calls to execute against the operator's instance instead of its own. This affects HTTP-mode deployments of n8n-mcp that are run as a shared multi-tenant service. Single-tenant deployments (ENABLE_MULTI_TENANT unset or false) are not affected. This vulnerability is fixed in 2.51.2.

Overview

State
—
Assigner (CNA)
—
CVSS severity
high
CVSS score
CVSS 8.1 / 10 8.1 8.1 / 10
CVSS vector
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Effective score
8.1 / 10 HIGH source: CNA overview
CWE(s)
—
Reserved
—
Published
—
Last updated
—
Source
https://www.tenable.com/cve/CVE-2026-45707
Linked Threat
CVE-2026-45707 — CVE-2026-45707

NVD / KEV / EPSS data refreshed 2026-05-25 00:05 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-33318
Assigner
GitHub_M
Published
May 29, 2026, 1:35:42 PM
Updated
Jun 1, 2026, 7:06:14 PM
EUVD base score (CVSS 3.1)
8.1 / 10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EUVD-reported EPSS
0.2400
Vendors
czlonkowski
Products
n8n-mcp (< 2.51.2)
Aliases
GHSA-jxx9-px88-pj69

ENISA description: n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.2, when ENABLE_MULTI_TENANT=true, the HTTP transport documents that the target n8n instance is selected per-request from x-n8n-url / x-n8n-key headers. Requests that omitted those headers — or supplied only one of them — silently fell back to the process-level N8N_API_URL / N8N_API_KEY credentials configured for the operator's own n8n instance. As a result, an authenticated MCP tenant could cause n8n management calls to execute against the operator's instance instead of its own. This affects HTTP-mode deployments of n8n-mcp that are run as a shared multi-tenant service. Single-tenant deployments (ENABLE_MULTI_TENANT unset or false) are not affected. This vulnerability is fixed in 2.51.2.

EUVD references (3)

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (6)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-45707.json.

Not stored.