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CVE-2026-59259— n8n - Permission Bypass via Expression Parser Mismatch in External Secrets

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 1.123.61之前版本、2.27.4版本之前和2.28.1版本之前存在授权问题漏洞，该漏洞源于外部秘密处理过程中静态验证检查与运行时表达式引擎之间的不匹配，导致权限绕过，允许具有凭证创建或更新权限但缺少externalSecret:list范围的认证用户，以静态验证无法检测的形式将外部秘密引用嵌入凭证中，这些引用在工作流执行时解析，暴露用户未授权访问的秘密值。

AI Predicted 7.4 Difficulty: Easy EPSS 0.44% · P36

Affected Version Matrix 6

VendorProduct Version RangeStatus
n8n n8n < 1.123.61 affected
1.123.61 unaffected
< 2.28.1 affected
2.28.1 unaffected
< 2.27.4 affected
2.27.4 unaffected
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I. Basic Information for CVE-2026-59259

Vulnerability Information
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Vulnerability Title
n8n - Permission Bypass via Expression Parser Mismatch in External Secrets
Source: CVE Program / CVE List V5
Vulnerability Description
n8n before versions 1.123.61, 2.27.4, and 2.28.1 contains a permission bypass vulnerability in external secrets handling caused by a mismatch between the static validation check and the runtime expression engine. An authenticated user with credential create or update permissions but without the externalSecret:list scope can embed external secret references into credentials in forms the static validation does not detect; these references resolve at workflow execution time, exposing secret values the user is not authorized to access. This issue only affects instances where an external secrets provider is configured and Advanced Permissions are in use.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 授权问题漏洞
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 1.123.61之前版本、2.27.4版本之前和2.28.1版本之前存在授权问题漏洞，该漏洞源于外部秘密处理过程中静态验证检查与运行时表达式引擎之间的不匹配，导致权限绕过，允许具有凭证创建或更新权限但缺少externalSecret:list范围的认证用户，以静态验证无法检测的形式将外部秘密引用嵌入凭证中，这些引用在工作流执行时解析，暴露用户未授权访问的秘密值。
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 ~ 1.123.61 -
n8n n8n 0 ~ 2.28.1 -
n8n n8n 0 ~ 2.27.4 -

II. Public POCs for CVE-2026-59259

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III. Intelligence Information for CVE-2026-59259

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Vendor Advisories for CVE-2026-59259 (1)

Other References for CVE-2026-59259 (1)

Same Patch Batch · n8n · 2026-07-15 · 5 CVEs total

CVE-2026-56352 6.4 MEDIUM n8n - Arbitrary File Read and Execution via ExecuteWorkflow localFile Parameter
CVE-2026-56353 4.8 MEDIUM n8n - Authentication Bypass in Chat Trigger Node
CVE-2026-59254 n8n - External Secrets Disclosure via Workflow Node Expressions
CVE-2026-56349 n8n - Guardrail Node Bypass via Crafted Input

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n
Same weakness: CWE-639

V. Comments for CVE-2026-59259

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