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CVE-2026-103256— n8n before 2.39.6 and 2.40.x before 2.40.1 Credentials Leak via preAuthentication Hook

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 2.39.6 之前以及 2.40.0 至 2.40.1 之前的版本中存在一个凭据泄露漏洞，该漏洞影响 Wekan 和 Baserow 的用户名和密码凭据。此漏洞会将未加密的密码发送至未经验证的主机。拥有凭据更新权限的攻击者可以修改主机字段，从而将账户密码发送到任意主机，绕过域名验证控制。

CVSS 7.1 · High

Possible ATT&CK Techniques 1 AI

T1567 · Exfiltration Over Web Service
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I. Basic Information for CVE-2026-103256

Vulnerability Information
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Vulnerability Title
n8n before 2.39.6 and 2.40.x before 2.40.1 Credentials Leak via preAuthentication Hook
Source: CVE Program / CVE List V5
Vulnerability Description
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain a credentials leak vulnerability in the Wekan and Baserow username-and-password credentials that sends unencrypted passwords to unvalidated hosts. Attackers with credential update permissions can modify the host field to receive account passwords at arbitrary hosts, bypassing domain validation controls.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的凭证保护机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
n8n-io n8n 0 ~ 2.39.6 -

II. Public POCs for CVE-2026-103256

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III. Intelligence Information for CVE-2026-103256

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Other References for CVE-2026-103256 (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-2026-103251 7.1 HIGH n8n before 1.123.80, 2.39.6, and 2.40.1 Package Install Validation Bypass via PubSub
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
Same vendor: n8n-io
Same weakness: CWE-522

V. Comments for CVE-2026-103256

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