CVE-2026-126391
Deferred Deferred - Pending Action

Insufficient Sandbox Escape in n8n Workflow Expressions

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
n8n before 1.123.89 contains an insufficient isolation vulnerability in workflow expression evaluation that allows authenticated users to escape the sandbox. Attackers with permission to create or modify workflows can craft expressions referencing unexpected JavaScript properties to execute arbitrary code on the n8n host.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-126391
EUVD
EUVD-2026-125174

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
n8n n8n 1.123.89

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

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Executive Summary

n8n before 1.123.89 has an insufficient isolation flaw in workflow expression evaluation. Authenticated users with workflow creation or modification permissions can escape the sandbox and execute arbitrary code on the n8n host system.

Detection Guidance

Detecting this vulnerability requires checking the version of n8n installed on your system. Compare the installed version against the patched versions (1.123.89, 2.45.5, 2.46.1, 3.0.1 or later). If your version is older, the system is vulnerable.

Impact Analysis

Attackers could gain control over the n8n host system, leading to potential data breaches, unauthorized access, or disruption of services. This could affect confidentiality, integrity, and availability of the system.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations may face legal penalties, reputational damage, and loss of trust.

Mitigation Strategies

Immediately upgrade n8n to a patched version (1.123.89 or later, 2.45.5+, 2.46.1+, or 3.0.1+). As temporary measures, restrict workflow creation/modification permissions to trusted users only, audit existing workflows for suspicious expressions, and review global member permissions to remove untrusted access.

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