Medium severity · published Aug 20, 2026
CVE-2026-77073
n8n before 2.34.1 Cross-Project Credential Access via MCP
4.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N8
n8n · n8n-io
2.34.0 before 2.34.1; 2.0.0 before 2.33.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-77073
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-77073
Mitigation
https://github.com/n8n-io/n8n/security/advisories/GHSA-vfrj-582q-mvcp
Third Party Advisory
https://www.vulncheck.com/advisories/n8n-before-cross-project-credential-access-via-mcp
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