EUVD-2026-42263
GHSA-xhqv-vmw5-79pm
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network endpoint requires only low-privilege auth (PR:L); scope changes because downstream connected systems absorb unintended mutations (S:C); no availability impact to n8n itself.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Authorization bypass in n8n's evaluation test runs endpoint allows authenticated users with only read access to execute workflows, leading to unauthorized data mutations, outbound API calls, or other downstream side effects. The issue affects n8n versions prior to 1.123.55, 2.25.7, and 2.26.2. No active exploitation has been observed, and EPSS predicts a low 0.16% chance of widespread attacks, though the vulnerability may be exploited in targeted scenarios.
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today