---
id: CVE-2026-65591
aliases:
  - GHSA-pm35-fqvh-cq5g
title: >-
  n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code
  Execution
summary: >-
  n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code
  Execution
severity: high
cwe:
  - CWE-917
vendor: n8n
product: n8n
ecosystem: npm
affected:
  - n8n < 1.123.64
  - 'n8n >= 2.30.0, < 2.30.1'
  - 'n8n >= 2.0.0-rc.0, < 2.29.8'
patched:
  - n8n 1.123.64
  - n8n 2.30.1
  - n8n 2.29.8
published: '2026-07-22'
updated: '2026-07-22'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-pm35-fqvh-cq5g'
references:
  - url: 'https://github.com/n8n-io/n8n/security/advisories/GHSA-pm35-fqvh-cq5g'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65591'
  - url: 'https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.64'
  - url: 'https://github.com/n8n-io/n8n/releases/tag/n8n@2.29.8'
  - url: 'https://github.com/n8n-io/n8n/releases/tag/n8n@2.30.1'
  - url: >-
      https://www.vulncheck.com/advisories/n8n-before-sanitizer-bypass-remote-code-execution
  - url: 'https://github.com/advisories/GHSA-pm35-fqvh-cq5g'
tags:
  - ghsa
  - npm
  - exploit-available
ingestedAt: '2026-07-22T22:06:57.404Z'
epss: 0.00481
epssPercentile: 0.40645
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/IamDremig/CVE-2026-65591'
  checkedAt: '2026-09-24T07:53:12.408Z'
exploitAvailable: true
---

## Overview

## Impact
The legacy expression evaluator's computed-member sanitizer can be bypassed by an authenticated user with workflow create or modify permissions. Successful exploitation grants the attacker host-level code execution as the n8n process.

The legacy expression engine is the default engine in affected versions.

## Patches
The issue has been fixed in n8n versions 1.123.64, 2.29.8, and 2.30.1. Users should upgrade to one of these versions or later to remediate the vulnerability.

## Workarounds
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
- Restrict n8n instance access to fully trusted users only.
- Switch to the non-legacy expression engine by setting `N8N_EXPRESSION_ENGINE=vm`.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

## Affected packages

- `n8n < 1.123.64`
- `n8n >= 2.30.0, < 2.30.1`
- `n8n >= 2.0.0-rc.0, < 2.29.8`

## Remediation

Upgrade to a patched release:

- `n8n 1.123.64`
- `n8n 2.30.1`
- `n8n 2.29.8`