CVE-2026-55608: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor in czlonkowski n8n-mcp
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.57.4, multi-tenant HTTP mode with ENABLE_MULTI_TENANT=true could allow an authenticated tenant to access default-scope workflow_versions backups instead of being confined to the tenant scope, exposing or deleting workflow-version backups from prior single-tenant deployments or migrations. This issue is fixed in version 2.57.4.
AI Analysis
Technical Summary
The vulnerability in n8n-mcp (CVE-2026-55608) involves improper access control in multi-tenant HTTP mode with ENABLE_MULTI_TENANT=true. Authenticated tenants could access default-scope workflow_versions backups rather than being restricted to their own tenant scope. This exposure allows unauthorized access or deletion of workflow-version backups from previous single-tenant deployments or migrations. The issue is fixed in version 2.57.4.
Potential Impact
An authenticated tenant with low privileges could gain unauthorized read or delete access to workflow version backups belonging to other tenants or prior single-tenant deployments. This leads to exposure of sensitive workflow backup data and potential data loss. The impact is limited to confidentiality and integrity with no availability impact.
Mitigation Recommendations
Upgrade n8n-mcp to version 2.57.4 or later, where this access control issue is fixed. There is no indication of alternative mitigations or temporary workarounds. Patch status is confirmed fixed in 2.57.4.
CVE-2026-55608: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor in czlonkowski n8n-mcp
Description
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.57.4, multi-tenant HTTP mode with ENABLE_MULTI_TENANT=true could allow an authenticated tenant to access default-scope workflow_versions backups instead of being confined to the tenant scope, exposing or deleting workflow-version backups from prior single-tenant deployments or migrations. This issue is fixed in version 2.57.4.
CVSS v3.1
Score 4.2medium
Affected software
pkg:github/czlonkowski/n8n-mcpRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in n8n-mcp (CVE-2026-55608) involves improper access control in multi-tenant HTTP mode with ENABLE_MULTI_TENANT=true. Authenticated tenants could access default-scope workflow_versions backups rather than being restricted to their own tenant scope. This exposure allows unauthorized access or deletion of workflow-version backups from previous single-tenant deployments or migrations. The issue is fixed in version 2.57.4.
Potential Impact
An authenticated tenant with low privileges could gain unauthorized read or delete access to workflow version backups belonging to other tenants or prior single-tenant deployments. This leads to exposure of sensitive workflow backup data and potential data loss. The impact is limited to confidentiality and integrity with no availability impact.
Mitigation Recommendations
Upgrade n8n-mcp to version 2.57.4 or later, where this access control issue is fixed. There is no indication of alternative mitigations or temporary workarounds. Patch status is confirmed fixed in 2.57.4.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T23:31:22.445Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a57f59668715ace437838dc
Added to database: 07/15/2026, 21:03:18 UTC
Last enriched: 07/22/2026, 22:54:23 UTC
Last updated: 08/25/2026, 22:52:12 UTC
Views: 101
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