CVE-2026-27495
Received Received - Intake
JavaScript Sandbox Escape in n8n Enables Host Compromise

Publication date: 2026-02-25

Last updated on: 2026-03-04

Assigner: GitHub, Inc.

Description
n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, an authenticated user with permission to create or modify workflows could exploit a vulnerability in the JavaScript Task Runner sandbox to execute arbitrary code outside the sandbox boundary. On instances using internal Task Runners (default runner mode), this could result in full compromise of the n8n host. On instances using external Task Runners, the attacker might gain access to or impact other task executed on the Task Runner. Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`. The issue has been fixed in n8n versions 2.10.1, 2.9.3, and 1.123.22. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations. Limit workflow creation and editing permissions to fully trusted users only, and/or use external runner mode (`N8N_RUNNERS_MODE=external`) to limit the blast radius. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
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Meta Information
Published
2026-02-25
Last Modified
2026-03-04
Generated
2026-06-16
AI Q&A
2026-02-26
EPSS Evaluated
2026-06-14
NVD
CVE-2026-27495
EUVD
EUVD-2026-8758
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
n8n n8n to 1.123.22 (exc)
n8n n8n From 2.0.0 (inc) to 2.9.3 (exc)
n8n n8n From 2.10.0 (inc) to 2.10.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
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Executive Summary

This vulnerability exists in the n8n workflow automation platform prior to versions 2.10.1, 2.9.3, and 1.123.22. An authenticated user who has permission to create or modify workflows can exploit a flaw in the JavaScript Task Runner sandbox to execute arbitrary code outside the sandbox boundary.

If the instance uses internal Task Runners (the default mode), this can lead to a full compromise of the host running n8n. If external Task Runners are used, the attacker might gain access to or affect other tasks executed on the Task Runner.

The vulnerability requires Task Runners to be enabled with the environment variable `N8N_RUNNERS_ENABLED=true`. It has been fixed in the specified versions, and upgrading is recommended to remediate the issue.

Impact Analysis

The impact of this vulnerability can be severe. On systems using internal Task Runners, an attacker exploiting this flaw can fully compromise the host machine running n8n, potentially gaining complete control over it.

On systems using external Task Runners, the attacker may gain unauthorized access to other tasks running on the Task Runner or disrupt their execution.

This could lead to unauthorized code execution, data breaches, service disruption, and other serious security consequences.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

To mitigate this vulnerability, users should upgrade n8n to versions 2.10.1, 2.9.3, or 1.123.22 or later, where the issue has been fixed.

If upgrading immediately is not possible, administrators should consider temporary mitigations such as limiting workflow creation and editing permissions to fully trusted users only.

Additionally, using external runner mode by setting `N8N_RUNNERS_MODE=external` can help limit the blast radius of an attack.

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

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