CVE-2026-77073: Authorization Bypass Through User-Controlled Key in n8n-io n8n
Description
n8n versions prior to 2.34.1 contain an authorization bypass vulnerability in the MCP create_workflow_from_code tool when the authentication type is set to an expression. This flaw allows attackers with a valid MCP Bearer API key and knowledge of a target credential ID to persist unauthorized cross-project credential references on workflows across different projects. The vulnerability has a medium severity rating with a CVSS 4.0 score of 5.3.
CVSS v4.0
Score 5.3medium
Affected software
n8n-io
n8n
n8n-io
n8n
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-77073 is an authorization bypass vulnerability affecting n8n versions before 2.34.1. The issue exists in the MCP create_workflow_from_code tool when the authentication type is configured as an expression. An attacker possessing a valid MCP Bearer API key and knowledge of a target credential ID can exploit this flaw to bypass credential validation and persist unauthorized credential references across different projects' workflows.
Potential Impact
Successful exploitation allows an attacker with limited privileges (valid MCP Bearer API key) to bypass credential validation and reference credentials across projects without authorization. This could lead to unauthorized access to sensitive credentials within workflows in different projects, potentially compromising workflow integrity and confidentiality.
Mitigation Recommendations
A fix is available in n8n version 2.34.1. Users should upgrade to version 2.34.1 or later to remediate this vulnerability. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-20T10:51:39.783Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a86e706acd9273b498befb0
Added to database: 08/20/2026, 11:37:42 UTC
Last enriched: 09/11/2026, 05:03:32 UTC
Last updated: 10/04/2026, 18:53:18 UTC
Views: 60
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