CVE-2026-110852

Deferred Deferred - Pending Action

Authentication Bypass in n8n Workflow Execution

Publication date: 2026-10-14

Last updated on: 2026-10-15

Assigner: VulnCheck

Description

n8n before 1.123.83, 2.x before 2.41.4, and 2.42.x before 2.42.1 contains an authentication bypass because dynamic-path webhook resolution matched requests on the path alone, ignoring the server-generated identifier that is the URL's only unguessable component. Unauthenticated attackers can omit this identifier in requests to webhook, form, or MCP routes to execute workflows in unrelated projects under those projects' credentials.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-14

Last Modified

2026-10-15

Generated

2026-10-19

AI Q&A

2026-10-15

EPSS Evaluated

2026-10-18

NVD

CVE-2026-110852

EUVD

EUVD-2026-101735

Affected Vendors & Products

Vendor	Product	Version / Range
n8n-io	n8n	0
n8n-io	n8n	2.0.0
n8n-io	n8n	2.42.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-288	The product requires authentication, but the product has an alternate path or channel that does not require authentication.

Attack-Flow Graph

Executive Summary

This vulnerability is an authentication bypass in n8n versions before 1.123.83, 2.x before 2.41.4, and 2.42.x before 2.42.1. It occurs because dynamic-path webhook resolution matches requests based solely on the path, ignoring a server-generated identifier that should make the URL unguessable. Attackers can omit this identifier to execute workflows in unrelated projects under those projects' credentials.

Detection Guidance

To detect this vulnerability, check if your n8n instance is running a vulnerable version (before 1.123.83, 2.x before 2.41.4, or 2.42.x before 2.42.1). Inspect webhook, form, or MCP routes for missing server-generated identifiers in requests. Monitor for unauthorized workflow executions under unrelated projects.

Impact Analysis

Unauthenticated attackers could exploit this to run unauthorized workflows in projects they don't own, potentially accessing sensitive data, modifying workflows, or triggering unintended actions. This could lead to data breaches, service disruptions, or unauthorized system access depending on the workflows' permissions.

Compliance Impact

This vulnerability could lead to unauthorized access or data exposure, violating GDPR's data protection principles or HIPAA's security requirements for protected health information. Organizations using affected n8n versions may face compliance violations, legal penalties, or reputational damage if exploited.

Mitigation Strategies

Upgrade n8n to version 1.123.83 or later, 2.41.4 or later, or 2.42.1 or later to address the authentication bypass issue.

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