TI-2026-40141 Aliases CVE-2026-55608 GHSA-2cf7-hpwf-47h9

n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode

LOW 24CWE-200Published 2026-07-15 · Updated 2026-07-17

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Information disclosure, Security bypass
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-200 and CWE-863.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0028 20th percentileScored 2026-11-07

Fix Fixed n8n-mcp (czlonkowski): 2.57.4n8n-mcp (npm): 2.57.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
czlonkowski	n8n-mcp	before 2.57.4	2.57.4	Patch available	CNA
—	n8n-mcp (npm)	before 2.57.4	2.57.4	Patch available	GHSA-2cf7-hpwf-47h9

n8n-mcp Vendorczlonkowski Affected before 2.57.4 Fixed in 2.57.4 Patch available CNA
n8n-mcp (npm) Vendor— Affected before 2.57.4 Fixed in 2.57.4 Patch available GHSA-2cf7-hpwf-47h9

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:n8n-mcp:n8n-mcp::::::::	before 2.57.4	Vulnerable	czlonkowski

cpe:2.3:a:n8n-mcp:n8n-mcp:*:*:*:*:*:*:*:* Versions before 2.57.4 Vulnerable ·czlonkowski

Remediation

Fix · CNA n8n-mcp (czlonkowski) Fixed in 2.57.4
Fix · GHSA-2cf7-hpwf-47h9 n8n-mcp (npm) Fixed in 2.57.4 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-55608
2026-10-03 Alias added: GHSA-2cf7-hpwf-47h9

References

Patch 1

https://github.com/czlonkowski/n8n-mcp/commit/1f42899749ed0c584fb6b4fd63d75233c3edee59

Advisory 1

https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-2cf7-hpwf-47h9

Other 3

TI-2026-38986 n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments CVSS 3.1CRITICAL 9.9
TI-2026-28830 n8n-MCP has an Authenticated SSRF via instance-URL header in multi-tenant HTTP mode CVSS 3.1HIGH 8.5
TI-2026-30738 n8n-MCP: IPv4-mapped IPv6 addresses bypass SSRF protection in validateUrlSync(), enabling full SSRF for SDK embedders CVSS 3.1HIGH 8.5
TI-2026-33447 Improper access control in czlonkowski n8n-mcp CVSS 3.1HIGH 8.1
TI-2026-32585 n8n-MCP: Authenticated SSRF in n8n-mcp webhook and API client paths CVSS 4.0HIGH 7.2
TI-2026-30081 n8n-MCP Logs Sensitive Request Data on Unauthorized /mcp Requests CVSS 3.1MEDIUM 5.3

See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences