How exploitable is this vulnerability in practice?

Exploitation is highly practical in environments where users with workflow-authoring permissions are not fully trusted. Because the attacker can control JavaScript executed by the Task Runner, a flawed sandbox can often be bypassed with crafted code, leading to host-level impact when internal runners are used.

Does an attacker need network or system-level access to exploit this?

No additional system or network-level access is required beyond an authenticated n8n account with permissions to create or modify workflows that run in the JavaScript Task Runner. The attack is carried out entirely through n8n's workflow interface or its APIs.

What is the safest general fix pattern for similar issues?

The safest pattern is to avoid running user-influenced code in a privileged context. If running user-authored JavaScript is required, it should execute in a strongly isolated environment (e.g., separate container or process with minimal privileges) with a narrow, carefully audited interface to host resources. The sandbox should expose only the minimal necessary capabilities, with clear boundaries between workflow code and infrastructure.

Severity:

CRITICAL RISK

(9.9)

Server-Side JavaScript Code Injection (CWE-94) in n8n Task Runner Sandbox

CVE-2026-27495

Published:

Feb 25, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Remote Code Execution

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CRITICAL

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SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Remote Code Execution via SQL Injection on the Database Server

March 7, 2026

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94

Impact:

Remote Code Execution by Authenticated Users

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94

Impact:

Remote Code Execution by Authenticated Users

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

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Server-Side JavaScript Code Injection (CWE-94) in n8n Task Runner Sandbox

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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