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n8n EUVDEUVD-2026-42612

| CVE-2026-59206 HIGH
Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)
2026-07-09 GitHub_M
Information Disclosure Prototype Pollution N8n
7.1
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:L/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
8.5 HIGH

Network-reachable API with only default low-privilege access (PR:L); scope changes (S:C) because pollution grants unauthenticated requests privilege, primarily disclosing data (C:H) with minor integrity impact.

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

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:L/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
Patch available
Jul 09, 2026 - 17:01 EUVD
Analysis Generated
Jul 09, 2026 - 16:25 vuln.today

DescriptionCVE.org

n8n is an open source workflow automation platform. Prior to 1.123.61, 2.27.4, and, 2.28.1, an authenticated user with the default workflow:create permission could pollute Object.prototype through a crafted workflow saved, updated, or imported via the workflow API, allowing unauthenticated requests to be treated as a privileged user and exposing user and project listing endpoints. This issue is fixed in versions 1.123.61, 2.27.4, and 2.28.1.

AnalysisAI

Privilege escalation via prototype pollution in n8n workflow automation lets an authenticated low-privilege user (holding the default workflow:create permission) corrupt Object.prototype through a crafted workflow saved, updated, or imported via the workflow API. Once polluted, subsequent unauthenticated requests are evaluated as a privileged user, exposing internal user and project listing endpoints. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with default workflow:create permission
Delivery
Craft workflow JSON with __proto__ payload
Exploit
Save/import via workflow API
Execution
Pollute server-wide Object.prototype
Persist
Send unauthenticated request treated as privileged
Impact
Enumerate user and project listing endpoints
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated n8n account holding the workflow:create permission - which is granted by DEFAULT, so any standard instance member qualifies - plus the ability to save, update, or import a crafted workflow via the workflow API. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N with subsequent-system SC:L/SI:L) describes a network-reachable, low-complexity attack requiring only low privileges and no user interaction, yielding high confidentiality impact - consistent with the description's requirement for a valid account holding the default workflow:create permission. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with an ordinary n8n account (default workflow:create permission) crafts a workflow JSON containing a __proto__ payload and saves or imports it through the workflow API, polluting Object.prototype server-wide. They then issue unauthenticated requests that are now evaluated as a privileged user, enumerating internal user and project listing endpoints to harvest account and project metadata. …
Remediation Vendor-released patch: upgrade to n8n 1.123.61, 2.27.4, or 2.28.1 depending on your release line, per advisory GHSA-75qm-gp28-rcq9 (https://github.com/n8n-io/n8n/security/advisories/GHSA-75qm-gp28-rcq9). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Audit all n8n instances for users holding workflow:create permission; immediately restrict this permission to trusted administrative accounts only. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Same weakness CWE-1321 – Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

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EUVD-2026-42612 vulnerability details – vuln.today
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