high7.1
CVE-2026-59206
n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | n8n | < 1.123.61 | 1.123.61 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| N8n | N8n | before 1.123.61 from 2.0.0 before 2.27.4 Version 2.28.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-75qm-gp28-rcq9
- https://github.com/n8n-io/n8n/security/advisories/GHSA-75qm-gp28-rcq9
- https://nvd.nist.gov/vuln/detail/CVE-2026-59206
- https://github.com/n8n-io/n8n/releases/tag/n8n%402.27.4
- https://github.com/n8n-io/n8n/releases/tag/n8n%402.28.1