CVE-2026-54052Network attack vector

Cross-tenant backup disclosure and deletion via unscoped records

Published Jul 15, 2026 · Updated Jul 15, 2026

Authorization bypass in n8n-MCP before 2.56.1 allows remote authenticated users to read and delete other tenants' workflow backups. The workflow_versions table lacks a tenant or instance key, and repository queries read, list, retrieve, delete, roll back, and prune records without tenant filtering. Exploitation requires HTTP mode, ENABLE_MULTI_TENANT=true, a shared instance and database, and an authenticated tenant; stdio and single-tenant deployments are unaffected.

CVSS severity9.9
Critical
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in n8n-MCP before 2.56.1 allows remote authenticated users to read and delete other tenants' workflow backups. The workflow_versions table lacks a tenant or instance key, and repository queries read, list, retrieve, delete, roll back, and prune records without tenant filtering. Exploitation requires HTTP mode, ENABLE_MULTI_TENANT=true, a shared instance and database, and an authenticated tenant; stdio and single-tenant deployments are unaffected.

The record

CVE
CVE-2026-54052
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
Ai Advisors Romuald Czlonkowski
Product
n8n-MCP
Classifications
CWE-639, CWE-862, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.56.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ai Advisors Romuald Czlonkowski · n8n-MCPversion=< 2.56.1

Published CVSS scores

9.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
CWE-862Missing Authorization
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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