Critical
n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments
Type: advisorySources: OSV
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.56.1, in HTTP mode with multi-tenancy enabled through ENABLE_MULTI_TENANT=true, n8n-mcp's local workflow version history backups were not isolated per tenant, allowing an authenticated tenant to read workflow version snapshots belonging to other tenants and delete or destroy other tenants' stored backups, including full node definitions, credential references, and authorization headers. This issue is fixed in version 2.56.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-54052
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 04:15 UTC · Revision 1
Source evidence
n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments
core-osv · Original sourcePublished 15 Jul 2026, 20:34 UTC
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.56.1, in HTTP mode with multi-tenancy enabled through ENABLE_MULTI_TENANT=true, n8n-mcp's local workflow version history backups were not isolated per tenant, allowing an authenticated tenant to read workflow version snapshots belonging to other tenants and delete or destroy other tenants' stored backups, including full node definitions, credential references, and authorization headers. This issue is fixed in version 2.56.1.
osv:CVE-2026-54052
Complete source record
{
"id": "051e4e7a4122721e1aced1a746eac5ca322d50aa103b544f22fa4f983703b327",
"url": "https://osv.dev/vulnerability/CVE-2026-54052",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments",
"summary": "n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.56.1, in HTTP mode with multi-tenancy enabled through ENABLE_MULTI_TENANT=true, n8n-mcp's local workflow version history backups were not isolated per tenant, allowing an authenticated tenant to read workflow version snapshots belonging to other tenants and delete or destroy other tenants' stored backups, including full node definitions, credential references, and authorization headers. This issue is fixed in version 2.56.1.",
"evidence": "osv:CVE-2026-54052",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-54052",
"aliases": [
"CVE-2026-54052",
"GHSA-j6r7-6fhx-77wx"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/czlonkowski/n8n-mcp",
"type": "GIT",
"events": [
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},
{
"fixed": "ed0447d8a0a87ad45436ff5ee1af49a76667c965"
}
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{
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{
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
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{
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"source": "REFERENCES_TAG",
"original_tag": "v2.56.1"
},
{
"cpe": "cpe:2.3:a:n8n-mcp:n8n-mcp:*:*:*:*:*:*:*:*",
"range": [
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"source": "CPE_RANGE"
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54052.json"
}
}
],
"modified": "2026-10-28T02:30:33.108827190Z",
"provider": "osv",
"references": [
"https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.56.1",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54052.json",
"https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-j6r7-6fhx-77wx",
"https://nvd.nist.gov/vuln/detail/CVE-2026-54052"
],
"provider_metadata": {
"cwe_ids": [
"CWE-639",
"CWE-862"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54052.json"
}
},
"related_cves": [
{
"value": "CVE-2026-54052",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 500239,
"published_at": "2026-07-15T20:34:10.748+00:00"
}