PT-2026-33891
Published
2026-04-10
·
Updated
2026-04-10
Description by
CVSS 3.1
8.2
HighMetricsAV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Summary
Several HTTP transport endpoints in n8n-mcp lacked proper authentication, and the health check endpoint exposed sensitive operational metadata without credentials.
Impact
An unauthenticated attacker with network access to the n8n-mcp HTTP server could disrupt active MCP sessions and gather information useful for further attacks.
Patches
Fixed in v2.47.6. All MCP session endpoints now require Bearer authentication. The health check endpoint has been reduced to a minimal liveness response.
Workarounds
If you cannot upgrade immediately:
- Restrict network access to the HTTP server using firewall rules, reverse proxy IP allowlists, or a VPN so that only trusted clients can reach it.
- Use stdio mode (
MCP MODE=stdio) instead of HTTP mode. The stdio transport does not expose any HTTP endpoints and is unaffected by this vulnerability.
Upgrading to v2.47.6 is still strongly recommended.
Credit
Reported by @yotampe-pluto.
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