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CVE-2026-21877— n8n is vulnerable to Remote Code Execution via Arbitrary File Write

Quick assessment

Affected
n8n-io n8n
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

n8n是n8n开源的一个可扩展的工作流自动化工具。 n8n 0.121.2及之前版本存在代码问题漏洞，该漏洞源于经过身份验证的攻击者可执行恶意代码，可能导致完全破解。

CVSS 10.0 · Critical EPSS 5.45% · P93

Public Exploits 1

Nuclei · 1 CVE-2026-21877.yaml [template]

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-21877

Vulnerability Information
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Vulnerability Title
n8n is vulnerable to Remote Code Execution via Arbitrary File Write
Source: CVE Program / CVE List V5
Vulnerability Description
n8n is an open source workflow automation platform. In versions 0.121.2 and below, an authenticated attacker may be able to execute malicious code using the n8n service. This could result in full compromise and can impact both self-hosted and n8n Cloud instances. This issue is fixed in version 1.121.3. Administrators can reduce exposure by disabling the Git node and limiting access for untrusted users, but upgrading to the latest version is recommended.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
n8n是n8n开源的一个可扩展的工作流自动化工具。 n8n 0.121.2及之前版本存在代码问题漏洞，该漏洞源于经过身份验证的攻击者可执行恶意代码，可能导致完全破解。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
n8n-io n8n < 1.121.3 -

II. Public POCs for CVE-2026-21877

# POC Description Source Link Shenlong Link
1 CVE-2026-21877 https://github.com/Ashwesker/Ashwesker-CVE-2026-21877 POC Details
2 n8n versions >= 0.123.0 and < 1.121.3 contain a critical authenticated remote code execution vulnerability via arbitrary file write. An authenticated user can exploit the Git node to overwrite critical files and execute untrusted code on the n8n server, potentially leading to full system compromise. The vulnerability affects both self-hosted and n8n Cloud instances. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21877.yaml POC Details
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III. Intelligence Information for CVE-2026-21877

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Patches & Fixes for CVE-2026-21877 (1)

Vendor Advisories for CVE-2026-21877 (1)

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-94

V. Comments for CVE-2026-21877

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