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BREW-n8n-mcp-CVE-2026-54052 — n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments

Affected: Homebrew: n8n-mcp

## Impact

In multi-tenant HTTP deployments — where a single n8n-mcp server serves several tenants — the locally stored workflow version history (the automatic backups taken before workflow updates) was not isolated per tenant. An authenticated tenant could read workflow version snapshots belonging to other tenants, and could delete or destroy other tenants' stored backups.

A stored snapshot includes full node definitions, so the exposed data can contain credential references and authorization headers configured on nodes. This is therefore a confidentiality issue in addition to an integrity/availability one.

## Affected configurations

- HTTP mode with multi-tenancy enabled (`ENABLE_MULTI_TENANT=true`), where multiple tenants are served by a single shared instance and database.

Not affected:

- stdio / single-user deployments (e.g. Claude Desktop). - Single-tenant HTTP deployments (one tenant per instance and database).

## Affected versions

`<= 2.56.0`

## Patched version

`2.56.1`. The stored version history is now isolated per instance, so a tenant can only access its own backups. Upgrading runs a one-time migration that isolates existing history and clears previously stored, un-scoped backups (these are auto-created, short-retention backups).

## Workarounds

If users cannot upgrade immediately:

- Disable the workflow version tool by setting `DISABLED_TOOLS=n8n_workflow_versions` in the server environment (for example, in your Docker `.env`). This removes the affect…

EUVD-2026-338609

fkie_cve-2026-54052

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.56.1, in HTTP mode with multi-tenancy enabled through ENABLE_MULTI_TENANT=true, n8n-mcp's local workflow version history backups were not isolated per tenant, allowing an authenticated tenant to read workflow version snapshots belonging to other tenants and delete or destroy other tenants' stored backups, including full node definitions, credential references, and authorization headers. This issue is fixed in version 2.56.1.

GHSA-j6r7-6fhx-77wx — n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments

Affected: npm: n8n-mcp