Vulnary
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Critical· 9.9official fix available

CVE-2026-54052

A flaw in n8n-mcp allows one tenant to see and delete the workflow backups of other tenants when multi‑tenancy is enabled. The bug lets an authenticated user read sensitive data such as credentials and authorization headers from other tenants’ backups. The issue is fixed in version 2.56.1.

publishedJul 16, 2026
last modifiedJul 18, 2026
sourcesNVD
severity · cvss
9.9
critical · how bad it is
exploitation · epss
<1%
14th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 18, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

n8n‑mcp versions earlier than 2.56.1 that run with ENABLE_MULTI_TENANT=true.

02

Real-world impact

An attacker who can log in as a tenant could read other tenants’ workflow history, including credentials and node definitions, and could delete or destroy those backups, potentially causing data loss and exposing sensitive information.

03

Why this severity

The CVSS score of 9.9 reflects that the vulnerability can be exploited over the network with low effort, requires only low privileges, and changes the scope of the affected system. It grants high confidentiality and integrity impact while only modestly affecting availability, leading to a critical rating.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade n8n‑mcp to version 2.56.1 or later.

NVD-referenced vendor advisory

05

Timeline

  1. Jul 16, 2026 · 18d ago
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 18, 2026 · 15d ago
    Advisory updated
    The NVD record was last revised.
  3. Jul 19, 2026 · 15d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredLow
User interactionNone needed
ScopeChanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactLow
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
CVE-2026-54052: A flaw in n8n-mcp allows one tenant to see and delete the workflow bac · Vulnary