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CVE-2026-86076 Details

Description

n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the expression compiler sanitizer resolved through dynamically scoped this and did not reject reserved class member names. A class field named __sanitize could rebind the sanitizer and reach the Function constructor, enabling backend code execution and editor-preview JavaScript execution. The affected AST hook is PrototypeSanitizer in packages/workflow/src/expression-sandboxing.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/n8n-io/n8n/releases/tag/[email protected]	[email protected]	Release Notes
https://github.com/n8n-io/n8n/releases/tag/[email protected]	[email protected]	Release Notes
https://github.com/n8n-io/n8n/releases/tag/[email protected]	[email protected]	Release Notes
https://github.com/n8n-io/n8n/security/advisories/GHSA-hw8v-xxg5-vvvx	[email protected]	MitigationVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-94	Improper Control of Generation of Code ('Code Injection')	[email protected]

Affected Products

Product	Versions
n8n n8n	< 1.123.76 >= 2.0.0, < 2.37.7 >= 2.38.0, < 2.38.2
CPE cpe:2.3:a:n8n:n8n::::::node.js::* Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Sep 11, 2026	Initial Analysis	[email protected]
Sep 9, 2026	CVE Modified	CISA-ADP
Sep 8, 2026	New CVE Received	[email protected]