Medium
n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-55608
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 04:16 UTC · Revision 1
Source evidence
n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode
core-osv · Original sourcePublished 15 Jul 2026, 20:35 UTC
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.
osv:CVE-2026-55608
Complete source record
{
"id": "e0dbaa0415a43b78e272c89feeaea6853f9329bfb6b1c1e3077ce17ab70390a1",
"url": "https://osv.dev/vulnerability/CVE-2026-55608",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode",
"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.",
"evidence": "osv:CVE-2026-55608",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-55608",
"aliases": [
"CVE-2026-55608",
"GHSA-2cf7-hpwf-47h9"
],
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"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N"
}
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"affected": [
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{
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],
"modified": "2026-10-28T02:30:49.500164338Z",
"provider": "osv",
"references": [
"https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.57.4",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55608.json",
"https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-2cf7-hpwf-47h9",
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"source_id": "core-osv",
"document_id": 518060,
"published_at": "2026-07-15T20:35:29.539+00:00"
}