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CVE-2026-110847— n8n before 1.123.83, 2.41.4, and 2.42.1 Stored XSS via Chat Trigger customCss Parameter

Quick assessment

Affected
n8n-io 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 在版本 1.123.83 之前、2.x 在版本 2.41.4 之前，以及 2.42.x 在版本 2.42.1 之前，存在一个存储在聊天触发器（Chat Trigger）的托管聊天页面中的跨站脚本（XSS）漏洞。该漏洞源于对 customCss 值的不充分净化，导致其被作为 HTML 标记插入到页面中。工作流（Workflow）作者可以发布一个无需 n8n 用户身份验证即可访问的聊天内容，其有效载荷将在实例源上下文中执行，从而对已登录访问者的会话产生影响。

CVSS 7.0 · High
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I. Basic Information for CVE-2026-110847

Vulnerability Information
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Vulnerability Title
n8n before 1.123.83, 2.41.4, and 2.42.1 Stored XSS via Chat Trigger customCss Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
n8n before 1.123.83, 2.x before 2.41.4, and 2.42.x before 2.42.1 contains a stored cross-site scripting vulnerability in the Chat Trigger hosted-chat page, where insufficiently sanitised customCss values are interpolated into the page as markup. Workflow authors can publish a chat without n8n user authentication whose payload executes on the instance origin, acting on the sessions of signed-in visitors.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA: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

Affected Products

Vendor Product Affected Versions CPE Subscribe
n8n-io n8n 0 ~ 1.123.83 -

II. Public POCs for CVE-2026-110847

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III. Intelligence Information for CVE-2026-110847

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Other References for CVE-2026-110847 (2)

Same Patch Batch · n8n-io · 2026-10-14 · 14 CVEs total

CVE-2026-110843 8.2 HIGH n8n before 2.41.4 and 2.42.1 Unauthenticated Unbounded OAuth Client Persistence via Author
CVE-2026-110842 7.7 HIGH n8n before 2.41.4 and 2.42.1 Prototype Pollution via MCP Workflow-Validation Interpreter
CVE-2026-110845 7.7 HIGH n8n before 1.123.83, 2.41.4, and 2.42.1 Code Execution via Git Node Log Operation
CVE-2026-110850 7.2 HIGH n8n before 2.41.4 and 2.42.1 Credential Check Bypass via Agent Node Parameters
CVE-2026-110844 7.2 HIGH n8n before 1.123.83 Credential Authorization Bypass via Nested Inline Sub-Workflows
CVE-2026-110849 7.2 HIGH n8n before 1.123.83, 2.41.4, and 2.42.1 Stored XSS via Binary-Data File Preview
CVE-2026-110853 7.1 HIGH n8n before 1.123.83 Authorization Bypass via Execute Sub-workflow Inline JSON
CVE-2026-110846 7.0 HIGH n8n before 2.41.4 and 2.42.1 Send-and-Wait HMAC Signature Bypass via Waiting-Webhook
CVE-2026-110840 7.0 HIGH n8n before 2.41.4 and 2.42.1 SQL Injection via Microsoft SQL Node Query Field
CVE-2026-110852 6.3 MEDIUM n8n before 1.123.83, 2.41.4, and 2.42.1 Unauthenticated Workflow Execution via Dynamic-Pat
CVE-2026-110851 6.1 MEDIUM n8n before 2.41.4 and 2.42.1 Cross-Project Agent Ownership Transfer via Agents Create Endp
CVE-2026-110841 6.1 MEDIUM n8n before 2.41.4 and 2.42.0 Authorization Bypass in Agent Chat Resume Tool Approval
CVE-2026-110848 6.0 MEDIUM n8n before 1.123.83, 2.41.4, and 2.42.1 Prototype Pollution via AI Workflow Builder Connec

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-110847

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