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CVE-2026-110843— n8n before 2.41.4 and 2.42.1 Unauthenticated Unbounded OAuth Client Persistence via Authorize Endpoint

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 2.41.4 之前版本以及 2.42.x 系列中 2.42.1 之前的版本，存在一个未受控的资源消耗漏洞，该漏洞位于未认证的 OAuth 授权端点。该端点通过 URL 路径解析客户端，但却将调用者的原始标识符作为记录键存储。未认证的攻击者可以发送仅在查询字符串上存在差异的标识符，从而创建无限制数量的自有客户端记录，从而绕过注册数量限制，导致数据库不断增长直至磁盘空间耗尽。

CVSS 8.2 · High EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
n8n-io n8n < 2.41.4 affected
2.42.0< 2.42.1 affected
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I. Basic Information for CVE-2026-110843

Vulnerability Information
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Vulnerability Title
n8n before 2.41.4 and 2.42.1 Unauthenticated Unbounded OAuth Client Persistence via Authorize Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
n8n before 2.41.4 and 2.42.x before 2.42.1 contains an uncontrolled resource consumption vulnerability in the unauthenticated OAuth authorize endpoint, which resolves clients by URL path but stores the caller's raw identifier as the record key. Unauthenticated attackers can send identifiers differing only in their query string to create unlimited first-party client records that bypass the registration cap, growing the database until the disk fills.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
n8n-io n8n 0 ~ 2.41.4 -

II. Public POCs for CVE-2026-110843

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III. Intelligence Information for CVE-2026-110843

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Other References for CVE-2026-110843 (2)

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

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-2026-110847 7.0 HIGH n8n before 1.123.83, 2.41.4, and 2.42.1 Stored XSS via Chat Trigger customCss Parameter
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-770

V. Comments for CVE-2026-110843

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