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CVE-2026-56357— n8n - Webhook Forgery via Missing HMAC-SHA256 Signature Verification in GitHub Webhook Trigger

Quick assessment

Affected
n8n n8n
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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公司开源的一个可扩展的工作流自动化工具。 n8n 1.123.15之前版本和2.5.0之前版本存在授权问题漏洞，该漏洞源于GitHub Webhook Trigger节点未实现HMAC-SHA256签名验证，可能导致知晓webhook URL的攻击者发送未签名POST请求触发工作流并伪造GitHub webhook事件。以下版本受到影响：1.123.15之前版本和2.5.0之前版本。

CVSS 4.0 · Medium EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
n8n n8n < 1.123.15 affected
1.123.15 unaffected
2.0.0< 2.5.0 affected
2.5.0 unaffected
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I. Basic Information for CVE-2026-56357

Vulnerability Information
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Vulnerability Title
n8n - Webhook Forgery via Missing HMAC-SHA256 Signature Verification in GitHub Webhook Trigger
Source: CVE Program / CVE List V5
Vulnerability Description
n8n before 1.123.15 and 2.5.0 contains a webhook forgery vulnerability in the GitHub Webhook Trigger node that fails to implement HMAC-SHA256 signature verification. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary data, spoofing GitHub webhook events.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
n8n是n8n公司开源的一个可扩展的工作流自动化工具。 n8n 1.123.15之前版本和2.5.0之前版本存在授权问题漏洞，该漏洞源于GitHub Webhook Trigger节点未实现HMAC-SHA256签名验证，可能导致知晓webhook URL的攻击者发送未签名POST请求触发工作流并伪造GitHub webhook事件。以下版本受到影响：1.123.15之前版本和2.5.0之前版本。
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

Vendor Product Affected Versions CPE Subscribe
n8n n8n 0 ~ 1.123.15 -

II. Public POCs for CVE-2026-56357

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III. Intelligence Information for CVE-2026-56357

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Vendor Advisories for CVE-2026-56357 (2)

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n
Same weakness: CWE-290

V. Comments for CVE-2026-56357

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