| Component | n8n |
| Severity | high (CVSS 8.8) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Published (NVD) | 2026-09-08 |
| Last modified | 2026-09-11 |
| Affected versions | n8n < 1.123.76 n8n >= 2.0.0, < 2.37.7 n8n >= 2.38.0, < 2.38.2 |
| Fixed in | 1.123.76, 2.37.7, 2.38.2 |
| Weakness | CWE-94 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade n8n to
1.123.76or later (or the patched release of your branch: 2.37.7, 2.38.2). - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-86076
- https://github.com/n8n-io/n8n/security/advisories/GHSA-hw8v-xxg5-vvvx
- https://github.com/n8n-io/n8n/releases/tag/[email protected]
- https://github.com/n8n-io/n8n/releases/tag/[email protected]
- https://github.com/n8n-io/n8n/releases/tag/[email protected]
Read more
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