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CVE-2026-54052

n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments

Published: Jul 15, 2026Updated: Jul 18, 2026 Sources: CVE List NVDCWE-639
9.9CRITICAL
NVD MITRE
EPSS Score
0.2%
Top 86.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
Not available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:HI:HA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:LAvailability
Low
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Weaknesses

CWE-639CWE-862

Affected Products

czlonkowski
oss-project
n8n-mcpMixed
DevTools & CI / ci-cd
n8n-mcp
oss-project
n8n-mcpMixed
AI / ML / ai-agent-tooling

Exploitability

Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-j6r7-6fhx-77wx
github.com
https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.56.1
github.com
News mentions
1

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