Missing Authorization Affecting n8n-mcp package, versions <2.56.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published15 Jul 2026
- disclosed14 Jul 2026
- credit0xmagic0
Introduced: 14 Jul 2026
NewCVE-2026-54052 (opens in a new tab)How to fix?
Upgrade n8n-mcp to version 2.56.1 or higher.
Overview
n8n-mcp is an Integration between n8n workflow automation and Model Context Protocol (MCP)
Affected versions of this package are vulnerable to Missing Authorization in the workflow version history process in multi-tenant HTTP deployments due to improper isolation of stored backups between tenants. An attacker can access and manipulate other tenants' workflow version snapshots, potentially exposing sensitive data such as credential references and authorization headers, by making authenticated requests as a different tenant.
Note: This is only exploitable if the deployment is configured in HTTP mode with multi-tenancy enabled (ENABLE_MULTI_TENANT=true).
Workaround
This vulnerability can be mitigated by disabling the workflow version tool via the DISABLED_TOOLS=n8n_workflow_versions environment variable, running each tenant in a separate instance with its own database, or restricting network access to the HTTP endpoint to trusted operators.