CVE-2026-77073: Authorization Bypass Through User-Controlled Key in n8n-io n8n
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.
AI Analysis
Technical Summary
CVE-2026-77073 is an authorization bypass vulnerability in n8n versions before 2.34.1. The flaw exists in the MCP create_workflow_from_code tool when the authentication type is set to an expression. Attackers possessing a valid MCP Bearer API key and knowledge of a target credential ID can bypass credential validation, allowing them to persist unauthorized cross-project credential references on workflows across different projects.
Potential Impact
An attacker with limited privileges (valid MCP Bearer API key) and knowledge of a credential ID can bypass credential validation controls, potentially leading to unauthorized access to credentials across project boundaries. This could result in unauthorized use or exposure of sensitive credentials within the n8n automation workflows.
Mitigation Recommendations
No official fix or patch is currently confirmed for this vulnerability. Users should monitor the vendor's advisory for updates and consider restricting MCP Bearer API key distribution and credential ID exposure as interim mitigations. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
CVE-2026-77073: Authorization Bypass Through User-Controlled Key in n8n-io n8n
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.
CVSS v4.0
Score 5.3medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-77073 is an authorization bypass vulnerability in n8n versions before 2.34.1. The flaw exists in the MCP create_workflow_from_code tool when the authentication type is set to an expression. Attackers possessing a valid MCP Bearer API key and knowledge of a target credential ID can bypass credential validation, allowing them to persist unauthorized cross-project credential references on workflows across different projects.
Potential Impact
An attacker with limited privileges (valid MCP Bearer API key) and knowledge of a credential ID can bypass credential validation controls, potentially leading to unauthorized access to credentials across project boundaries. This could result in unauthorized use or exposure of sensitive credentials within the n8n automation workflows.
Mitigation Recommendations
No official fix or patch is currently confirmed for this vulnerability. Users should monitor the vendor's advisory for updates and consider restricting MCP Bearer API key distribution and credential ID exposure as interim mitigations. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-20T10:51:39.783Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a86e706acd9273b498befb0
Added to database: 08/20/2026, 11:37:42 UTC
Last enriched: 08/20/2026, 11:53:48 UTC
Last updated: 08/20/2026, 19:38:47 UTC
Views: 6
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