GHSA-75hx-xj24-mqrw n8n-mcp has unauthenticated session termination and information disclosure in HTTP transport
Unauthenticated attackers can terminate active sessions and access sensitive metadata via HTTP endpoints in the n8n MCP server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-75hx-xj24-mqrw?
GHSA-75hx-xj24-mqrw is a missing authorization vulnerability in n8n-mcp, published on 10 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by GHSA-75hx-xj24-mqrw?
2 open source packages ship an affected version, including n8n-mcp.
| Package | Affected | Fixed in |
|---|---|---|
n8n-mcp npm | All versions | 2.47.6 |
n8n-mcp npm | All versions | 2.47.6 |
How do I fix GHSA-75hx-xj24-mqrw?
Upgrade n8n-mcp to 2.47.6 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is GHSA-75hx-xj24-mqrw being exploited?
There is no known exploitation of GHSA-75hx-xj24-mqrw in the wild and no public exploit code.