CVE-2026-77073

UNKNOWN 0.0

n8n before 2.34.1 Cross-Project Credential Access via MCP

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-639
Vendor	n8n-io
Product	n8n
Published	Aug 20, 2026
Last Updated	Aug 20, 2026

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Affected Versions

n8n-io / n8n

0 < 2.34.1

n8n-io / n8n

0 < 2.33.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/n8n-io/n8n/security/advisories/GHSA-vfrj-582q-mvcp vulncheck.com: https://www.vulncheck.com/advisories/n8n-before-cross-project-credential-access-via-mcp

Credits

🔍 vonypeto