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CVE-2026-56356— n8n - Stored Cross-Site Scripting in Chat Trigger Node Custom CSS Field

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存在跨站脚本漏洞，该漏洞源于sanitize-html库配置不当，可能导致经过身份验证且具有创建或修改工作流权限的用户注入绕过清理的JavaScript，造成存储型跨站脚本。以下版本受到影响：1.123.27之前版本、2.0.0至2.13.2版本和2.14.0版本。

CVSS 5.4 · Medium EPSS 0.25% · P15

Affected Version Matrix 10

VendorProduct Version RangeStatus
n8n n8n < 1.123.27 affected
1.123.27 unaffected
2.0.0-rc.0< 2.13.3 affected
2.13.3 unaffected
2.14.0< 2.14.1 affected
2.14.1 unaffected
< 2.14.1 affected
2.14.1 unaffected
… +2 more rows
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I. Basic Information for CVE-2026-56356

Vulnerability Information
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Vulnerability Title
n8n - Stored Cross-Site Scripting in Chat Trigger Node Custom CSS Field
Source: CVE Program / CVE List V5
Vulnerability Description
n8n contains a stored cross-site scripting vulnerability in the Chat Trigger node's Custom CSS field due to a misconfiguration of the sanitize-html library. Affected releases are those before 1.123.27, the 2.0.0 through 2.13.2 line, and 2.14.0 (fixed in 1.123.27, 2.13.3, and 2.14.1). An authenticated user with permission to create or modify workflows can inject JavaScript that bypasses sanitization, resulting in stored XSS against any user who visits the public chat page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 跨站脚本漏洞
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存在跨站脚本漏洞，该漏洞源于sanitize-html库配置不当，可能导致经过身份验证且具有创建或修改工作流权限的用户注入绕过清理的JavaScript，造成存储型跨站脚本。以下版本受到影响：1.123.27之前版本、2.0.0至2.13.2版本和2.14.0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 ~ 1.123.27 -
n8n n8n 0 ~ 2.14.1 -
n8n n8n 0 ~ 2.13.3 -

II. Public POCs for CVE-2026-56356

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III. Intelligence Information for CVE-2026-56356

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Vendor Advisories for CVE-2026-56356 (1)

Other References for CVE-2026-56356 (1)

Same Patch Batch · n8n · 2026-06-30 · 3 CVEs total

CVE-2026-56350 6.3 MEDIUM n8n - SSO Enforcement Bypass via API
CVE-2026-56777 5.0 MEDIUM n8n - AST Validator Bypass in Python Code Node

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n
Same weakness: CWE-79

V. Comments for CVE-2026-56356

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