CVE-2026-86083

Received Received - Intake

Code Injection in n8n Workflow Automation Platform

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: GitHub, Inc.

Description

n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the legacy expression engine generated source text by calling the mutable global JSON.stringify while printing synthetic string literals and interpolating timezone data. An expression could replace JSON.stringify and cause later generated source to contain executable attacker-controlled code. The affected code-generation paths include packages/@n8n/expression-runtime/src/bridge/isolated-vm-bridge.ts and packages/@n8n/tournament/src/ExpressionBuilder.ts, and the issue does not affect the vm expression engine. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-09

AI Q&A

2026-09-09

EPSS Evaluated

N/A

NVD

CVE-2026-86083

Affected Vendors & Products

Vendor	Product	Version / Range
n8n	n8n	to 1.123.76 (inc)
n8n	n8n	to 2.37.7 (inc)
n8n	n8n	to 2.38.2 (inc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

Executive Summary

n8n versions before 1.123.76, 2.37.7, and 2.38.2 have a vulnerability where the legacy expression engine uses a mutable global JSON.stringify function. An attacker could replace this function to inject executable code into generated source text, affecting specific code-generation paths.

Detection Guidance

To detect this vulnerability, check the version of n8n installed on your system. If you are running versions prior to 1.123.76, 2.37.7, or 2.38.2, your system is vulnerable. Use commands like 'n8n --version' or check your package manager for installed versions.

Impact Analysis

If exploited, this vulnerability could allow an attacker to execute arbitrary code within the context of the n8n application. This could lead to unauthorized data access, manipulation, or system compromise depending on the permissions of the n8n instance.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's data protection principles or HIPAA's security requirements. Organizations using vulnerable n8n versions may face compliance violations, legal penalties, or reputational damage.

Mitigation Strategies

Immediately upgrade n8n to version 1.123.76, 2.37.7, or 2.38.2 or later. If upgrading is not possible, disable the legacy expression engine or restrict access to the affected components until the update is applied.

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