CVE-2026-77073
Received Received - Intake

Credential Validation Bypass in n8n MCP Workflow Tool

Publication date: 2026-08-20

Last updated on: 2026-08-20

Assigner: VulnCheck

Description
n8n versions before 2.34.1 contain a credential validation bypass in the MCP create_workflow_from_code tool when authentication type is set to an expression. Attackers with a valid MCP Bearer API key and knowledge of a target credential ID can persist unauthorized cross-project credential references on workflows in different projects.

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Meta Information

Published
2026-08-20
Last Modified
2026-08-20
Generated
2026-08-20
AI Q&A
2026-08-20
EPSS Evaluated
N/A
NVD
CVE-2026-77073
EUVD
EUVD-2026-63262

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
n8n n8n to 2.34.1 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

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Executive Summary

CVE-2026-77073 is a credential validation bypass in n8n versions before 2.34.1. It occurs in the MCP create_workflow_from_code tool when authentication type is set to an expression. Attackers with a valid MCP Bearer API key and knowledge of a target credential ID can persist unauthorized cross-project credential references on workflows in different projects.

Detection Guidance

Check n8n version with 'n8n --version' to confirm if it is below 2.34.1 or 2.33.4. Inspect workflows for unexpected cross-project credential references by reviewing MCP create_workflow_from_code tool configurations and credential bindings.

Impact Analysis

This vulnerability allows unauthorized users to create persistent references to credentials from other projects. While the actual execution may still block access, the references remain, potentially leading to credential exposure or misuse. Attackers could leverage this to map out credential relationships across projects.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing unauthorized access to credentials across projects. If exploited, it may lead to unauthorized data exposure or processing, violating data protection requirements under these regulations.

Mitigation Strategies

Upgrade n8n to version 2.34.1 or 2.33.4 immediately. Disable MCP server access if not required. Restrict instance access to trusted users only. Audit existing workflows for unauthorized cross-project credential references and remove them.

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