Critical severityNVD Advisory· Published Jul 15, 2026· Updated Jul 18, 2026
n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments
CVE-2026-54052
Description
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
n8n-mcpnpm | < 2.56.1 | 2.56.1 |
Affected products
1- Range: <2.56.1
Patches
Vulnerability mechanics
References
3- github.com/advisories/GHSA-j6r7-6fhx-77wxghsaADVISORY
- github.com/czlonkowski/n8n-mcp/releases/tag/v2.56.1ghsax_refsource_MISCWEB
- github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-j6r7-6fhx-77wxghsax_refsource_CONFIRMWEB
News mentions
1- ⚡ Weekly Recap: Rogue AI Agents, Check Point Exploit, Slopsquatting, ClickFix Lures and MoreThe Hacker News · Jul 27, 2026