n8n-mcp has unauthenticated session termination and information disclosure in HTTP transport
n8n-mcp versions from 2.14.1 up to but not including 2.47.6 have unauthenticated HTTP endpoints that allow session termination and expose sensitive operational metadata. An attacker with network access could disrupt active MCP sessions and gather information without authentication. The issue is fixed in version 2.47.6 by requiring Bearer authentication on MCP session endpoints and limiting the health check endpoint to a minimal response.
AI Analysis
Technical Summary
Several HTTP transport endpoints in n8n-mcp lacked proper authentication, allowing unauthenticated attackers with network access to terminate active MCP sessions and access sensitive operational metadata via the health check endpoint. The vulnerability affects versions >=2.14.1 and <2.47.6. The fix in version 2.47.6 enforces Bearer token authentication on all MCP session endpoints and reduces the health check endpoint to a minimal liveness response. Workarounds include restricting network access to the HTTP server or using stdio mode instead of HTTP mode.
Potential Impact
An unauthenticated attacker with network access to the n8n-mcp HTTP server can disrupt active MCP sessions, causing denial of service, and can gather sensitive operational metadata that may aid further attacks. The confidentiality impact is low, integrity impact is none, and availability impact is high as per the CVSS vector.
Mitigation Recommendations
Upgrade to n8n-mcp version 2.47.6 or later, where all MCP session endpoints require Bearer authentication and the health check endpoint is limited. If immediate upgrade is not possible, restrict network access to the HTTP server using firewall rules, reverse proxy IP allowlists, or VPNs to allow only trusted clients. Alternatively, use stdio mode (MCP_MODE=stdio) which does not expose HTTP endpoints and is not affected by this vulnerability.
n8n-mcp has unauthenticated session termination and information disclosure in HTTP transport
Description
n8n-mcp versions from 2.14.1 up to but not including 2.47.6 have unauthenticated HTTP endpoints that allow session termination and expose sensitive operational metadata. An attacker with network access could disrupt active MCP sessions and gather information without authentication. The issue is fixed in version 2.47.6 by requiring Bearer authentication on MCP session endpoints and limiting the health check endpoint to a minimal response.
CVSS v3.1
Score 8.2high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Several HTTP transport endpoints in n8n-mcp lacked proper authentication, allowing unauthenticated attackers with network access to terminate active MCP sessions and access sensitive operational metadata via the health check endpoint. The vulnerability affects versions >=2.14.1 and <2.47.6. The fix in version 2.47.6 enforces Bearer token authentication on all MCP session endpoints and reduces the health check endpoint to a minimal liveness response. Workarounds include restricting network access to the HTTP server or using stdio mode instead of HTTP mode.
Potential Impact
An unauthenticated attacker with network access to the n8n-mcp HTTP server can disrupt active MCP sessions, causing denial of service, and can gather sensitive operational metadata that may aid further attacks. The confidentiality impact is low, integrity impact is none, and availability impact is high as per the CVSS vector.
Mitigation Recommendations
Upgrade to n8n-mcp version 2.47.6 or later, where all MCP session endpoints require Bearer authentication and the health check endpoint is limited. If immediate upgrade is not possible, restrict network access to the HTTP server using firewall rules, reverse proxy IP allowlists, or VPNs to allow only trusted clients. Alternatively, use stdio mode (MCP_MODE=stdio) which does not expose HTTP endpoints and is not affected by this vulnerability.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BREW-n8n-mcp-GHSA-75hx-xj24-mqrw
- Osv Schema Version
- 1.7.3
- Ecosystems
- ["Homebrew"]
- Cvss Version
- 3.1
Threat ID: 6ac13973a43b0b3b89d5fe38
Added to database: 10/03/2026, 17:20:51 UTC
Last enriched: 10/03/2026, 17:28:07 UTC
Last updated: 10/03/2026, 22:37:08 UTC
Views: 4
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