How easily can this vulnerability be exploited in practice?

Exploitability depends on who can create or modify workflows. In environments where users with limited oversight can access powerful nodes, exploitation can be straightforward. In tightly controlled single-admin setups, the risk is lower but still present if credentials are compromised.

Does an attacker need administrator privileges to exploit this issue?

Not necessarily. The core requirement is an authenticated account with permissions to build or modify workflows using nodes that can fetch or execute content. These permissions are often less than full administrative access, especially in collaborative or multi-tenant environments.

What is the safest general fix pattern from an architectural standpoint?

Architecturally, the safest pattern is to treat workflow definitions as untrusted input, restrict or disable nodes that enable code execution or arbitrary content loading for non-admin users, and run workflow execution in a sandboxed, least-privilege environment separated from critical infrastructure.

Severity:

CRITICAL RISK

(9.9)

Code Injection (CWE-94) via Workflow Nodes in n8n Automation Platform

CVE-2026-21877

Published:

Jan 7, 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-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94;CWE-434

Impact:

Remote Code Execution and Full Service Compromise

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94;CWE-434

Impact:

Remote Code Execution and Full Service Compromise

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

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Code Injection (CWE-94) via Workflow Nodes in n8n Automation Platform

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

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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