CVE-2026-77073

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 v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/n8n-io/n8n/security/advisories/GHSA-vfrj-582q-mvcp	Mitigation Vendor Advisory
https://www.vulncheck.com/advisories/n8n-before-cross-project-credential-access-via-mcp	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:n8n:n8n::::::node.js::*
	cpe:2.3:a:n8n:n8n:2.34.0:::::node.js::

History

No history.

Information

Published : 2026-08-20 12:16

Updated : 2026-09-01 19:14

NVD link : CVE-2026-77073

Mitre link : CVE-2026-77073

CVE.ORG link : CVE-2026-77073

JSON object : View

Products Affected

n8n

n8n

CWE

CWE-639

Authorization Bypass Through User-Controlled Key

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