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CVE-2026-59206n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration
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.
7.1 HIGHEPSS 0.66%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 7.1 | HIGH | 4.0GitHub_M (CNA) | 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 |
| 7.1 | HIGH | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L |
Details
- CVE ID
- CVE-2026-59206
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Jul 9, 2026
- Last modified
- 2026-10-25 17:10 UTC
- Weaknesses
- CWE-1321 · Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Products
As published by the CNA in the CVE record.
n8n-ion8n3 version ranges
- >= 2.28.0, < 2.28.1
- >= 2.0.0-rc.0, < 2.27.4
- < 1.123.61