---
title: "CVE-2026-54052: n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments"
url: https://erroneo.us/security/cve/CVE-2026-54052/
description: "CVE-2026-54052 (n8n-mcp (npm)): n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-15
date_modified: 2026-07-18
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-54052"
kev: false
cvss: 9.9
epss: 0.00388
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-54052: n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.4% , percentile 32: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 32% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes n8n-mcp (npm) <= 2.56.0, fixed in 2.56.1 . Check your lockfile, including transitive dependencies.

## What it is

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 ENABLEMULTITENANT=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.

## Affected packages

- npm `n8n-mcp` <= 2.56.0 → fixed: 2.56.1

## Affected products (CVE record)

- czlonkowski n8n-mcp: < 2.56.1

## Severity

- GitHub_M CVSS 3.1: 9.9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L`
- GitHub CVSS 3.1: 9.9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.39% probability of exploitation activity in the next 30 days; percentile 32.

## Sources

- [GitHub Advisory GHSA-j6r7-6fhx-77wx](https://github.com/advisories/GHSA-j6r7-6fhx-77wx)
- [CVE.org record CVE-2026-54052](https://www.cve.org/CVERecord?id=CVE-2026-54052)
- [NVD entry CVE-2026-54052](https://nvd.nist.gov/vuln/detail/CVE-2026-54052)
- [github.com](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)

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Source page: https://erroneo.us/security/cve/CVE-2026-54052/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt