CVE-2026-59206 n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration
Authenticated users can pollute Object.prototype to gain unauthenticated privileged access, exposing user and project data in n8n.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-59206?
CVE-2026-59206 is a high-severity code injection vulnerability in N8n N8n, published on 9 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-1321
Which versions are affected by CVE-2026-59206?
6 open source packages ship an affected version, including n8n. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
n8n npm | All versions | 1.123.61 |
n8n npm | All versions | 1.123.61 |
n8n npm | From 2.0.0-rc.0 | 2.27.4 |
n8n npm | From 2.0.0-rc.0 | 2.27.4 |
n8n npm | From 2.28.0 | 2.28.1 |
n8n npm | From 2.28.0 | 2.28.1 |
Products include N8n N8n.
How do I fix CVE-2026-59206?
Upgrade n8n to a fixed version for your release line: 1.123.61, 2.27.4 or 2.28.1.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-59206 being exploited?
There is no known exploitation of CVE-2026-59206 in the wild and no public exploit code.
Other vulnerabilities in N8n N8n
- CVE-2025-68613 n8n Improper Control of Dynamically-Managed Code Resources
- CVE-2026-21877 n8n is vulnerable to Remote Code Execution via Arbitrary File Write
- CVE-2026-21858 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
- CVE-2026-1470 n8n Unsafe Workflow Expression Evaluation Allows Remote Code Execution
- CVE-2025-68668 n8n Vulnerable to Arbitrary Command Execution in Pyodide based Python Code Node
Sources
Also known as CLEANSTART-2026-EY43769, GHSA-75qm-gp28-rcq9, MINI-5hcv-6rxv-9gc3, ROOT-APP-NPM-CVE-2026-59206.