How broadly exploitable is this vulnerability?

Exploitation is limited to environments where users can create or modify workflows and then persuade a more privileged user to open a crafted binary-data URL while logged into n8n. It is not a fully unauthenticated attack, but once triggered, it can have critical impact.

What level of access does an attacker need to exploit this issue?

An attacker needs an authenticated account on the n8n instance with permissions to create or edit workflows. From there, they can generate malicious HTML output and rely on social engineering or in-app placement to get a privileged user to load the URL.

What is the safest general fix pattern for this type of vulnerability?

The safest pattern is to ensure that any user-controlled or workflow-generated HTML is never executed in the same origin as the core application. This typically means serving it as a download (`Content-Disposition: attachment`), applying a strict `Content-Security-Policy`, and/or isolating such content on a separate, sandboxed origin.

Severity:

CRITICAL RISK

(9.0)

Stored Cross-Site Scripting (CWE-79) via Inline HTML Binary Data in n8n Workflows

CVE-2026-33749

Published:

Mar 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-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:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Account Takeover and Privilege Escalation via Stored XSS

Severity:

CRITICAL RISK

(9.0)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Account Takeover and Privilege Escalation via Stored XSS

Severity:

CRITICAL RISK

(9.0)

CVSS Version:

3.1

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Stored Cross-Site Scripting (CWE-79) via Inline HTML Binary Data in n8n Workflows

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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