High severityNVD Advisory· Published Jul 9, 2026· Updated Jul 9, 2026
n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration
CVE-2026-59206
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 packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
n8nnpm | < 1.123.61 | 1.123.61 |
n8nnpm | >= 2.28.0, < 2.28.1 | 2.28.1 |
n8nnpm | >= 2.0.0-rc.0, < 2.27.4 | 2.27.4 |
Affected products
1Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-75qm-gp28-rcq9ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-59206ghsaADVISORY
- github.com/n8n-io/n8n/releases/tag/n8n%402.27.4ghsax_refsource_MISCWEB
- github.com/n8n-io/n8n/releases/tag/n8n%402.28.1ghsax_refsource_MISCWEB
- github.com/n8n-io/n8n/security/advisories/GHSA-75qm-gp28-rcq9ghsax_refsource_CONFIRMWEB
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