Prototype Pollution in N8n
CVE-2026-59206
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 impo…
Vulnerability class: Prototype Pollution
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L.
Affected products
- N8n — versions 2.28.0
- N8n-io N8n — versions >= 2.28.0, < 2.28.1, >= 2.0.0-rc.0, < 2.27.4, < 1.123.61
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-59206?
- CVE-2026-59206 is a high-severity vulnerability in N8n, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.1/10. Published 2026-07-09.
- How severe is CVE-2026-59206?
- High severity. CVSS v3 base score is 7.1 out of 10.