Vulnerability · Published Jul 15, 2026 · Assigned by GitHub_M

CVE-2026-55608n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode

Medium 4.2

In plain English

A medium-severity information exposure in n8n-mcp from czlonkowski. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.2Medium

Exploit odds (30 days)0.3%top 79.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n-mcp	2.57.4	GHSA-2cf7-hpwf-47h9

Affected products (as reported)

Vendor	Product	Versions
czlonkowski	n8n-mcp	< 2.57.4

Weakness: CWE-200, CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

References

https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-2cf7-hpwf-47h9 x_refsource_CONFIRM
https://github.com/czlonkowski/n8n-mcp/commit/1f42899749ed0c584fb6b4fd63d75233c3edee59 x_refsource_MISC
https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.57.4 x_refsource_MISC