Who can exploit this vulnerability?

Exploitation requires an authenticated user account with the ability to create or modify workflows. Anonymous users cannot exploit it directly, but in environments where many users can design workflows, the attack surface is broader.

Does exploitation require elevated privileges within the operating system?

No OS-level privileges are required beyond those of the n8n process itself. However, the impact depends on what the n8n service account can access—if it runs with high privileges or broad network reach, the consequences can be severe.

What is the safest general fix pattern?

The safest approach is to harden the expression evaluation model: remove or strictly constrain any expression capabilities that can generate or execute code or commands, and ensure that expression output is always treated as data, not executable instructions.

Severity:

CRITICAL RISK

(9.9)

Expression Injection Leading to Code Execution (CWE-94) in n8n Workflow Parameters

CVE-2026-27577

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

Recent Vulnerabilities

CWE-78

CRITICAL RISK

CRITICAL

(9.9)

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

Remote Code Execution

March 7, 2026

CWE-89

CRITICAL RISK

CRITICAL

(9.9)

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 / Expression 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 / Expression Injection

CWE:

CWE-94

Impact:

Remote Code Execution by Authenticated Users

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Expression Injection Leading to Code Execution (CWE-94) in n8n Workflow Parameters

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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