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.

• CWE-863

• https://github.com/n8n-io/n8n/security/advisories/GHSA-4r56-g65c-fm83Mitigation, Vendor Advisory
• https://www.vulncheck.com/advisories/n8n-before-2.36.2-credential-exfiltration-via-workflow-tool-nodeThird Party Advisory

Published

Sep 3, 2026

Last Modified

Oct 29, 2026

Status

Analyzed

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