CVE-2026-103251— n8n before 1.123.80, 2.39.6, and 2.40.1 Package Install Validation Bypass via PubSub
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 在以下版本中存在一个验证绕过漏洞：1.123.80 之前的版本、2.0.0 至 2.39.6（不含）之间的版本，以及 2.40.0 至 2.40.1（不含）之间的版本。该漏洞存在于队列模式部署的社区包安装处理程序中。拥有 Redis 写权限的攻击者可以绕过名称验证、权限检查、校验和验证以及 npm 安全检查，从而在所有集群实例上未经身份认证即可安装任意 npm 包。
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I. Basic Information for CVE-2026-103251
Vulnerability Information
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Vulnerability Title
n8n before 1.123.80, 2.39.6, and 2.40.1 Package Install Validation Bypass via PubSub
Source: CVE Program / CVE List V5
Vulnerability Description
n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a validation bypass vulnerability in the community package installation handler for queue mode deployments. Attackers with Redis write access can bypass name validation, permission checks, checksum verification, and npm safety checks to install arbitrary npm packages across all cluster instances without authentication.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-103251
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Vendor Advisories for CVE-2026-103251 (2)
Same Patch Batch · n8n-io · 2026-10-01 · 16 CVEs total
| CVE-2026-103248 | 9.0 CRITICAL | n8n before 1.123.80, 2.39.6, and 2.40.1 PostgREST Filter Injection via Supabase |
| CVE-2026-103255 | 9.0 CRITICAL | n8n before 1.123.80, 2.39.6, and 2.40.1 Path Traversal and Query Injection via Supabase |
| CVE-2026-103253 | 8.7 HIGH | n8n before 1.123.80, 2.39.6, and 2.40.1 SQL Injection via Oracle Database Drop Table |
| CVE-2026-103247 | 8.5 HIGH | n8n before 1.123.80 Credential Tampering via Duplicate Node IDs |
| CVE-2026-103250 | 8.1 HIGH | n8n before 1.123.80, 2.39.6, and 2.40.1 NoSQL Injection via MongoDB Chat Memory |
| CVE-2026-103257 | 7.7 HIGH | n8n before 1.123.80, 2.39.6, and 2.40.1 Path Traversal via n8n Node |
| CVE-2026-103246 | 7.7 HIGH | n8n before 2.39.6 and 2.40.x before 2.40.1 Credential Disclosure via Node-Tool Introspecti |
| CVE-2026-103252 | 7.7 HIGH | n8n before 1.123.80, 2.39.6, and 2.40.1 Information Disclosure via Credential Test Endpoin |
| CVE-2026-103249 | 7.6 HIGH | n8n before 1.123.80, 2.39.6, and 2.40.1 Stored DOM XSS via Resource Locator |
| CVE-2026-103259 | 7.6 HIGH | n8n before 2.39.6 and 2.40.x before 2.40.1 Session Token Leak via Dynamic Credentials |
| CVE-2026-103256 | 7.1 HIGH | n8n before 2.39.6 and 2.40.x before 2.40.1 Credentials Leak via preAuthentication Hook |
| CVE-2026-103258 | 6.8 MEDIUM | n8n before 2.39.6 and 2.40.x before 2.40.1 Filter Bypass via Parameter Interpolation |
| CVE-2026-103254 | 6.3 MEDIUM | n8n before 1.123.80, 2.39.6, and 2.40.1 Path Traversal via Resume URL Generation |
| CVE-2026-103245 | 5.3 MEDIUM | n8n before 1.123.80, 2.39.6, and 2.40.1 Missing Webhook Signature Verification |
| CVE-2026-103260 | 4.0 MEDIUM | n8n before 2.39.6 and 2.40.x before 2.40.1 Approval Bypass via Send and Wait Node |
IV. Related Vulnerabilities
Same product: n8n
-
CVE-2026-103260
n8n before 2.39.6 and 2.40.x before 2.40.1 Approval Bypass v -
CVE-2026-103259
n8n before 2.39.6 and 2.40.x before 2.40.1 Session Token Lea -
CVE-2026-103258
n8n before 2.39.6 and 2.40.x before 2.40.1 Filter Bypass via -
CVE-2026-103257
n8n before 1.123.80, 2.39.6, and 2.40.1 Path Traversal via n -
CVE-2026-103256
n8n before 2.39.6 and 2.40.x before 2.40.1 Credentials Leak
Same vendor: n8n-io
-
CVE-2026-103260
n8n before 2.39.6 and 2.40.x before 2.40.1 Approval Bypass v -
CVE-2026-103259
n8n before 2.39.6 and 2.40.x before 2.40.1 Session Token Lea -
CVE-2026-103258
n8n before 2.39.6 and 2.40.x before 2.40.1 Filter Bypass via -
CVE-2026-103257
n8n before 1.123.80, 2.39.6, and 2.40.1 Path Traversal via n -
CVE-2026-103256
n8n before 2.39.6 and 2.40.x before 2.40.1 Credentials Leak
Same weakness: CWE-862
-
CVE-2026-82041
UTMStack < 11.2.16 Missing Authorization via Command WebSock -
CVE-2026-104991
Phproject < 1.8.7 Missing Authorization via Issues REST API -
CVE-2026-104914
MISP: Soft-Deleted Attributes from Other Organizations Expos -
CVE-2026-104912
MISP Correlation Authorization Bypass Exposes Restricted Eve -
CVE-2026-96613
Missing Authorization in Meari IoT Cloud Platform OpenAPI Se
V. Comments for CVE-2026-103251
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