n8n prototype pollution enables confused-deputy execution via public webhooks
- Product
- n8n
- CVE
- CVE-2026-54306
- Affected
- n8n < 2.25.7 and >= 2.26.0, < 2.26.2
- Fixed in
- 2.25.7 and 2.26.2
Last verified against sources: October 26, 2026
Am I affected?
n8n: affected n8n < 2.25.7 and >= 2.26.0, < 2.26.2. Fixed in 2.25.7 and 2.26.2.
- Check your version: run
npm ls n8n. Versions >= 2.26.0, < 2.26.2 of n8n are affected. [1]
What to do now
- Upgrade to the fixed version: run
npm install n8n@2.26.2(first patched version 2.26.2). [1] - Upgrade to n8n 2.25.7 or 2.26.2 or later. [1]
- Avoid exposing public (unauthenticated) webhook workflows that pass incoming data through transform nodes into action nodes with sensitive credentials or database operations. [1]
- Limit workflow creation and editing permissions to fully trusted users only. [1]
General practice, not from the source: if the affected software could read tokens or credentials, rotate them after upgrading; pin versions and review changes before updating tools your agents run.
What happened
- A prototype pollution vulnerability allowed a crafted public webhook payload to inject attacker-controlled fields into workflow data during internal object copying. [1]
- These fields could be surfaced and consumed as normal values by downstream built-in nodes. [1]
- The issue has been fixed in n8n versions 2.25.7, and 2.26.2. [1]
Impact
- 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. [1]
- An attacker could cause the workflow to target unintended records or issue outbound requests using the workflow owner's configured credentials. [1]
What was done
Sources
- GHSA-2vff-hj5x-8gq7 — GitHub Advisory Database
Every statement above was checked against these sources before publishing. Spotted an error? Tell us and we will correct it with a dated note.
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[CVE-2026-54306] n8n prototype pollution enables confused-deputy execution via public webhooks
Product: n8n | Affected: n8n < 2.25.7 and >= 2.26.0, < 2.26.2 | Fixed in: 2.25.7 and 2.26.2
Summary: A prototype pollution vulnerability allowed a crafted public webhook payload to inject attacker-controlled fields into workflow data during internal object copying.
Source & remediation on AgentArmorHQ: https://agentarmorhq.com/incidents/2026/06/cve-2026-54306-n8nCorrections
Report an error or request a correction. We review requests within 5 business days and add a dated correction note.
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