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CVE-2026-56776— n8n - Incorrect OAuth Scope Validation in Workflow Test Run Endpoint

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存在授权问题漏洞，该漏洞源于在POST /workflows/{workflowId}/test-runs/new端点中存在授权绕过，使用workflow:read范围代替workflow:execute进行访问授权，导致已通过身份验证且仅具有工作流只读访问权限的用户可以触发真实的评估测试运行，引发工作流通过内部工作流运行器执行，从而在连接的下游系统中导致非预期的出站API调用、数据变更或其他副作用。以下版本受到影响：1.123.55之前版本、

CVSS 7.4 · High EPSS 0.28% · P18

Affected Version Matrix 6

VendorProduct Version RangeStatus
n8n n8n < 1.123.55 affected
1.123.55 unaffected
< 2.26.2 affected
2.26.2 unaffected
< 2.25.7 affected
2.25.7 unaffected
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I. Basic Information for CVE-2026-56776

Vulnerability Information
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Vulnerability Title
n8n - Incorrect OAuth Scope Validation in Workflow Test Run Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
n8n before 1.123.55, 2.25.7, and 2.26.2 contains an authorization bypass in the POST /workflows/{workflowId}/test-runs/new endpoint, which authorizes access using the workflow:read scope instead of workflow:execute. An authenticated user with read-only access to a workflow can trigger a real evaluation test run, causing the workflow to execute via the internal workflow runner and resulting in unintended outbound API calls, data mutations, or other side effects in connected downstream systems. The issue primarily affects instances using the Evaluations feature where RBAC project roles grant workflow:read without workflow:execute.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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存在授权问题漏洞，该漏洞源于在POST /workflows/{workflowId}/test-runs/new端点中存在授权绕过，使用workflow:read范围代替workflow:execute进行访问授权，导致已通过身份验证且仅具有工作流只读访问权限的用户可以触发真实的评估测试运行，引发工作流通过内部工作流运行器执行，从而在连接的下游系统中导致非预期的出站API调用、数据变更或其他副作用。以下版本受到影响：1.123.55之前版本、
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 ~ 1.123.55 -
n8n n8n 0 ~ 2.26.2 -
n8n n8n 0 ~ 2.25.7 -

II. Public POCs for CVE-2026-56776

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III. Intelligence Information for CVE-2026-56776

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Vendor Advisories for CVE-2026-56776 (2)

Same Patch Batch · n8n · 2026-07-08 · 7 CVEs total

CVE-2026-56778 6.4 MEDIUM n8n - Authorization Bypass in Public API Execution Retry Endpoint
CVE-2026-56359 5.4 MEDIUM n8n - Cross-Site Scripting in Credential Management OAuth2 Authorization URL
CVE-2026-56775 5.4 MEDIUM n8n - Incorrect OAuth Scope Validation in Evaluation Test Runs Endpoints
CVE-2026-56360 4.0 MEDIUM n8n - Webhook Forgery via Unsigned POST Requests in ZendeskTrigger
CVE-2026-59253 n8n - Improper Authorization in Workflow Assignment to Folders
CVE-2026-59257 n8n - SQL Injection in MySQL v1 executeQuery Operation via Expression Interpolation

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n
Same weakness: CWE-863

V. Comments for CVE-2026-56776

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