CVE-2026-45707

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

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

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Source

https://www.tenable.com/cve/CVE-2026-45707

Linked Threat

CVE-2026-45707 — CVE-2026-45707

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

EUVD enrichment is queued; refresh the page in a few seconds.

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.

• https://github.com/czlonkowski/n8n-mcp/commit/853015d0897be7cf2d9d4726de195c938e4395ab tenable:github.com
• https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.2 tenable:github.com
• https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-jxx9-px88-pj69 tenable:github.com
• https://www.first.org/epss/ tenable:www.first.org
• https://nvd.nist.gov/vuln/detail/CVE-2026-45707 tenable:nvd.nist.gov
• https://www.cve.org/CVERecord?id=CVE-2026-45707 tenable:www.cve.org

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

• Oracle Critical Patch Update, April 2026 Security Update Review
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  web:symfony.com

  Email Header Injection via Non-Token Characters in Mime Parameter Names

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  web:www.bleepingcomputer.com

  Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.

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• Microsoft Confirms Active 0-Day Exploit—Check Emergency Mitigation
  web:www.forbes.com

  Updated May 17: This article, originally published May 16, has been updated to include further details on the emergency mitigation process recommended after the CVE - 2026 -42897 Microsoft Exchange ...

  2026-05-26 02:54 UTC
• Oracle Critical Patch Update Advisory - April 2026
  web:www.oracle.com

  This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

  2026-05-26 02:54 UTC
• Windows 11's Secure Boot fix update finally rolls out to ... - PCWorld
  web:www.pcworld.com

  Windows 11's Secure Boot fix update finally rolls out to more PCs Important security certificates for Windows 11 will soon expire for many users.

  2026-05-26 02:54 UTC
• Windows 11 April 2026 Update tested: What's new, improved and fixed
  web:www.windowslatest.com

  Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.

  2026-05-26 02:54 UTC
• Patch Tuesday May 2026: Security Updates & CVE Analysis
  web:zecurit.com

  Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

  2026-05-26 02:54 UTC

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