CVE-2026-77073
5.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| n8n-io | n8n | 0 < 2.34.1 | affected |
| n8n-io | n8n | 2.34.1 | unaffected |
| n8n-io | n8n | 0 < 2.33.4 | affected |
| n8n-io | n8n | 2.33.4 | unaffected |
Weaknesses
- CWE-639: Authorization Bypass Through User-Controlled Key
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-vfrj-582q-mvcp
- https://www.vulncheck.com/advisories/n8n-before-cross-project-credential-access-via-mcp
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