TI-2026-39202 Aliases CVE-2026-54306 GHSA-2vff-hj5x-8gq7

n8n: Prototype Pollution enables confused-deputy execution via public webhooks

LOW 34CWE-1321Published 2026-06-23 · Updated 2026-06-26

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, a prototype pollution vulnerability allowed a crafted public webhook payload to inject attacker-controlled fields into workflow data during internal object copying. These fields could be surfaced and consumed as normal values by downstream built-in nodes. Where a workflow combines a public webhook with action nodes that consume the resulting fields, an attacker could cause the workflow to act as a confused deputy — targeting unintended records or issuing outbound requests using the workflow owner's configured credentials. This vulnerability is fixed in 2.25.7 and 2.26.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0028 20th percentileScored 2026-11-07

Fix Fixed n8n (n8n-io): 2.26.2, 2.25.7n8n (npm): 2.26.2, 2.25.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
n8n	n8n	2.26.0 to before 2.26.2; before 2.25.7	2.26.2, 2.25.7	Patch available	CNA
—	n8n (npm)	2.26.0 to before 2.26.2	2.26.2	Patch available	GHSA-2vff-hj5x-8gq7
—	n8n (npm)	before 2.25.7	2.25.7	Patch available	GHSA-2vff-hj5x-8gq7

n8n Vendorn8n Affected 2.26.0 to before 2.26.2; before 2.25.7 Fixed in 2.26.2, 2.25.7 Patch available CNA
n8n (npm) Vendor— Affected 2.26.0 to before 2.26.2 Fixed in 2.26.2 Patch available GHSA-2vff-hj5x-8gq7
n8n (npm) Vendor— Affected before 2.25.7 Fixed in 2.25.7 Patch available GHSA-2vff-hj5x-8gq7

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:n8n:n8n::::::node.js::*	before 2.25.7; 2.26.0 to before 2.26.2	Vulnerable	n8n

cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* Versions before 2.25.7; 2.26.0 to before 2.26.2 Vulnerable ·n8n

Remediation

Fix · CNA n8n (n8n-io) Fixed in 2.26.2, 2.25.7
Fix · GHSA-2vff-hj5x-8gq7 n8n (npm) Fixed in 2.26.2 Advisory →
Fix · GHSA-2vff-hj5x-8gq7 n8n (npm) Fixed in 2.25.7 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-54306
2026-10-03 Alias added: GHSA-2vff-hj5x-8gq7

References

Advisory 2

Other 1

https://github.com/n8n-io/n8n

TI-2025-42131 n8n Vulnerable to Remote Code Execution via Expression Injection KEVCVSS 3.1CRITICAL 10.0
TI-2026-17560 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling CVSS 3.1CRITICAL 10.0
TI-2026-01167 Authenticated users can bypass the Expression sandbox mechanism to achieve full remote… CVSS 3.1CRITICAL 9.9
TI-2026-00644 Sandbox escape in n8n Python task runner allows for arbitrary code execution on the underlying host. CVSS 3.1CRITICAL 9.9
TI-2025-35293 An arbitrary file upload vulnerability in the Chat Trigger component of N8N v1.95.3… CVSS 3.1HIGH 8.8
TI-2023-12275 The n8n package 0.218.0 for Node.js allows Escalation of Privileges. CVSS 3.1HIGH 8.8

See all 178 →

Sources

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