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CVE-2026-54052

N8n-mcp broken access control

9.9 CRITICALEPSS 0.39%
  1. Published15 Jul 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Affected products

N8n-mcp< 2.56.1

Remediation

Fixed in
N8n-mcp≥ 2.56.1

References

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Frequently asked

Is CVE-2026-54052 being actively exploited?

CVE-2026-54052 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.39%.

How severe is CVE-2026-54052?

CVE-2026-54052 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.39% probability of exploitation.

Which products are affected by CVE-2026-54052?

Affected products include N8n-mcp.

How do I fix CVE-2026-54052?

Upgrade affected software to a fixed version, for example N8n-mcp 2.56.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-54052 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.