CVE-2026-85166

n8n before 2.35.4 and 2.36.x before 2.36.2 does not validate credential references in the inline workflow JSON of nodes that execute an inline sub-workflow (e.g., the Workflow Tool node). A shared-workflow editor, or any user creating/updating a workflow via the REST API, Public API, or MCP, can persist a node referencing a credential they do not own. When the workflow is later executed under an identity that holds the credential, the inline sub-workflow resolves the secret and can send it to an attacker-controlled endpoint, resulting in credential exfiltration.

CVSS 4.0

7.2CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:L

CVSS 3.1

6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 29% of CVEs (scores of 2026-10-29)

CWE

CWE-863

Published

2026-09-03

Modified

2026-10-29

Record from

the NVD, synced 2026-10-29

Affected

• n8n:n8n

References

• https://github.com/n8n-io/n8n/security/advisories/GHSA-4r56-g65c-fm83
• https://www.vulncheck.com/advisories/n8n-before-2.36.2-credential-exfiltration-via-workflow-tool-node

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