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CVE-2026-77073 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/n8n-io/n8n/security/advisories/GHSA-vfrj-582q-mvcp	[email protected]	MitigationVendor Advisory
https://www.vulncheck.com/advisories/n8n-before-cross-project-credential-access-via-mcp	[email protected]	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-639	Authorization Bypass Through User-Controlled Key	[email protected]

Affected Products

Product	Versions
n8n n8n	< 2.33.4 2.34.0
CPE cpe:2.3:a:n8n:n8n::::::node.js::* cpe:2.3:a:n8n:n8n:2.34.0:::::node.js:: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Sep 1, 2026	Initial Analysis	[email protected]
Aug 25, 2026	CVE Modified	CISA-ADP
Aug 21, 2026	CVE Modified	[email protected]
Aug 20, 2026	New CVE Received	[email protected]