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n8n EUVDEUVD-2026-42268

| CVE-2026-59253 MEDIUM
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-07-08 disclosure@vulncheck.com GHSA-gqcv-rfj6-r29g
Authentication Bypass N8n
5.3
CVSS 4.0 · Vendor: vulncheck
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Severity by source

Vendor (vulncheck) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/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
vuln.today AI
5.0 MEDIUM

Network-accessible, authenticated (PR:L), no UI required; scope changes (S:C) because the attacker's actions corrupt another project's folder structure beyond their own security domain; integrity-only impact (I:L), no confidentiality or availability consequences.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

Primary rating from Vendor (vulncheck).

CVSS VectorVendor: vulncheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 08, 2026 - 15:18 vuln.today
Patch available
Jul 08, 2026 - 15:01 EUVD

DescriptionCVE.org

n8n before 2.28.0 contains an improper authorization vulnerability allowing authenticated users to assign workflows to folders in other projects. Attackers can bypass project and folder authorization boundaries by supplying crafted request payloads during workflow creation, causing logical integrity violations in target project folder structures.

AnalysisAI

Improper authorization in n8n before 2.28.0 enables authenticated users to assign workflows to folders belonging to foreign projects by supplying crafted payloads during workflow creation. The flaw (CWE-639) bypasses project and folder ownership checks entirely, allowing logical integrity violations across organizational boundaries in multi-project deployments. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to n8n with low-privileged account
Delivery
Enumerate or infer foreign project folder IDs via API
Exploit
Craft workflow creation payload referencing foreign folder ID
Execution
Submit request bypassing server-side authorization check
Persist
Workflow inserted into target project's folder structure
Impact
Target project folder integrity corrupted
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid n8n user account with workflow creation privileges (PR:L per CVSS 4.0 vector) - unauthenticated access alone is not sufficient. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.3 (Medium) accurately reflects the constrained real-world impact: only integrity is affected (VI:L on the vulnerable system, SI:L on subsequent systems), with no confidentiality breach or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated low-privileged n8n user enumerates or guesses folder IDs belonging to a different project they should not have access to, then submits a crafted workflow creation API request embedding one of those foreign folder IDs in the payload. The server accepts the request without validating cross-project ownership, inserting the workflow into the target project's folder hierarchy. …
Remediation Upgrade n8n to version 2.28.0 or later, which resolves the missing authorization check on folder assignment during workflow creation. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-42268 vulnerability details – vuln.today
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