CVE-2026-55608

MEDIUM

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

Title source: cna

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.

References (3)

Core 3

Core References

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

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

View Writeup ZIP pw:eip

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https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.57.4

Scores

CVSS v3 4.2

EPSS 0.0016

EPSS Percentile 6.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-200 CWE-863

Status published

Products (2)

czlonkowski/n8n-mcp < 2.57.4

n8n-mcp/n8n-mcp < 2.57.4

Published Jul 15, 2026

Tracked Since Jul 16, 2026