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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: NVD (National Vulnerability Database)
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)
Affected Products
VendorProductAffected VersionsCPESubscribe
n8n-ion8n < 1.121.3 -
II. Public POCs for CVE-2026-21877
#POC DescriptionSource LinkShenlong Link
1CVE-2026-21877https://github.com/Ashwesker/Ashwesker-CVE-2026-21877POC Details
2n8n 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.yamlPOC Details
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III. Intelligence Information for CVE-2026-21877
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IV. Related Vulnerabilities
Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-94
V. Comments for CVE-2026-21877

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