---
title: "CVE-2026-86076: n8n - Server-Side Template Injection"
description: "n8n < 1.123.76, 2.37.7, 2.38.2 contains a server-side template injection caused by improper sanitizer rebinding via reserved class member __sanitize in PrototypeSanitizer, letting attackers execute backend code and editor-preview JavaScript, exploit requires crafted expression with reserved class member."
url: https://panop.io/threat-heartbeat/CVE-2026-86076/
---

# CVE-2026-86076 n8n - Server-Side Template Injection

n8n < 1.123.76, 2.37.7, 2.38.2 contains a server-side template injection caused by improper sanitizer rebinding via reserved class member \_\_sanitize in PrototypeSanitizer, letting attackers execute backend code and editor-preview JavaScript, exploit requires crafted expression with reserved class member.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.79% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-86076)

## Details

Type

Server-Side Template Injection

Impact

Remote Code Execution, Client Script Exec

CVSS vector

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

Published

8 September 2026

Updated

15 October 2026

Weakness

[CWE-94](https://cwe.mitre.org/data/definitions/94.html)

## Vendor fix

Update to versions 1.123.76, 2.37.7, or 2.38.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-86076](https://nvd.nist.gov/vuln/detail/CVE-2026-86076)
- [https://github.com/n8n-io/n8n/security/advisories/GHSA-hw8v-xxg5-vvvx](https://github.com/n8n-io/n8n/security/advisories/GHSA-hw8v-xxg5-vvvx)
- [https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76](https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76)
- [https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7](https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7)
- [https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2](https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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