CVE-2026-54052
n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments
CVSS Score
9.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-639 CWE-862 |
| Vendor | czlonkowski |
| Product | n8n-mcp |
| Published | Jul 15, 2026 |
Stay Ahead of the Next One
Get instant alerts for czlonkowski n8n-mcp
Be the first to know when new critical vulnerabilities affecting czlonkowski n8n-mcp are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low
Affected Versions
czlonkowski / n8n-mcp
< 2.56.1