What’s Vulnerable › Vulnerabilities

CVE-2026-59206: n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-09 · updated 2026-10-25
• Weakness: CWE-1321

Description

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.

Affected products

• n8n-io n8n: before 1.123.61; from 2.0.0 before 2.27.4; 2.28.0 — fixed in 1.123.61, 2.27.4

How to fix

Upgrade to a fixed version: n8n-io n8n 1.123.61, 2.27.4. Check the vendor advisory for mitigations.

References

• https://github.com/n8n-io/n8n/releases/tag/n8n%402.27.4
• https://github.com/n8n-io/n8n/releases/tag/n8n%402.28.1
• https://github.com/n8n-io/n8n/security/advisories/GHSA-75qm-gp28-rcq9

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