| Component | n8n |
| Severity | medium (CVSS 4.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| Published (NVD) | 2026-08-20 |
| Last modified | 2026-09-01 |
| Affected versions | n8n < 2.33.4 n8n = 2.34.0 |
| Fixed in | 2.33.4 |
| Weakness | CWE-639 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade n8n to
2.33.4or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-77073
- 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
Read more
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