CVE-2026-45707

HIGH EPSS 14.4%
Published May 29, 20261mo ago · Modified Jun 17, 20262w ago
8.1 CVSS 3.1
High
Find Similar
Published May 29, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
8.1
Exploitability
2.8
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
14.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-284

Affected Products 1

VendorProductVersionRange
n8n-mcpn8n-mcp* <2.51.2

References 3

  • github.com https://github.com/czlonkowski/n8n-mcp/commit/853015d0897be7cf2d9d4726de195c938e4395ab
    Patch
  • github.com https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.2
    ProductRelease Notes
  • github.com https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-jxx9-px88-pj69
    MitigationVendor Advisory

Remediation

  • github.com https://github.com/czlonkowski/n8n-mcp/commit/853015d0897be7cf2d9d4726de195c938e4395ab
    Patch