CVE-2026-56351 n8n - SQL Injection in MySQL, PostgreSQL, and Microsoft SQL Nodes

What is CVE-2026-56351?

CVE-2026-56351 is a medium-severity SQL injection vulnerability in N8n N8n, published on 24 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

n8n before version 2.4.0 contains a sql injection vulnerability in MySQL, PostgreSQL, and Microsoft SQL nodes that allows authenticated users to inject arbitrary SQL through unescaped identifier values in node configuration parameters. Attackers with workflow creation permissions can supply specially crafted table or column names to execute unauthorized database commands and compromise data integrity.

Weakness: CWE-89

Which versions are affected by CVE-2026-56351?

2 open source packages ship an affected version, including n8n. It affects 1 product.

Products include N8n N8n.

How do I fix CVE-2026-56351?

Upgrade n8n to 2.4.0 or later.

Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.

Is CVE-2026-56351 being exploited?

There is no known exploitation of CVE-2026-56351 in the wild and no public exploit code.

Other vulnerabilities in N8n N8n

• CVE-2025-68613 n8n Improper Control of Dynamically-Managed Code Resources Exploited Critical 10.0
• CVE-2026-21877 n8n is vulnerable to Remote Code Execution via Arbitrary File Write Critical 10.0
• CVE-2026-21858 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling Critical 10.0
• CVE-2026-1470 n8n Unsafe Workflow Expression Evaluation Allows Remote Code Execution Critical 9.9
• CVE-2025-68668 n8n Vulnerable to Arbitrary Command Execution in Pyodide based Python Code Node Critical 9.9

All N8n N8n vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-f3f2-mcxc-pwjx.