n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration
- Product
- n8n
- CVE
- CVE-2026-59206
- Affected
- n8n < 1.123.61, 2.0.0-rc.0 to 2.27.4, and 2.28.0 to 2.28.1
- Fixed in
- 1.123.61, 2.27.4, 2.28.1
Last verified against sources: October 26, 2026
Am I affected?
n8n: affected n8n < 1.123.61, 2.0.0-rc.0 to 2.27.4, and 2.28.0 to 2.28.1. Fixed in 1.123.61, 2.27.4, 2.28.1.
- Check your version: run
npm ls n8n. Versions < 1.123.61 of n8n are affected. [1]
What to do now
- Upgrade to the fixed version: run
npm install n8n@1.123.61(first patched version 1.123.61). [1] - Upgrade to n8n 1.123.61, 2.27.4, or 2.28.1, or later. [1]
- Restrict workflow creation and editing permissions to fully trusted users only. [1]
- Restrict network access to the n8n instance to 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
- An authenticated user with the default
workflow:createpermission could polluteObject.prototypethrough a crafted workflow saved, updated, or imported via the workflow API. [1] - This can be leveraged to bypass authentication, allowing unauthenticated requests to be treated as a privileged user and exposing endpoints such as the user and project listings. [1]
Impact
What was done
Sources
- GHSA-75qm-gp28-rcq9 — 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-2026-59206] n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration
Product: n8n | Affected: n8n < 1.123.61, 2.0.0-rc.0 to 2.27.4, and 2.28.0 to 2.28.1 | Fixed in: 1.123.61, 2.27.4, 2.28.1
Summary: 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.
Source & remediation on AgentArmorHQ: https://agentarmorhq.com/incidents/2026/07/cve-2026-59206-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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