CVE-2026-59257: n8n - SQL Injection in MySQL v1 executeQuery Operation via Expression Interpolation

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-08 · updated 2026-10-29
Weakness: CWE-89

Description

n8n before 1.123.61, 2.x before 2.27.4, and 2.28.x before 2.28.1 contains a SQL injection vulnerability in the legacy MySQL v1 node's executeQuery operation. The operation substitutes evaluated {{ ... }} expression values directly into the raw SQL string without parameterization. When a workflow uses this operation with expression-sourced values and is connected to an externally-reachable trigger (such as a Webhook node), attacker-controlled input reaching those expressions results in SQL injection, allowing execution of arbitrary SQL with the configured MySQL credentials' privileges. The MySQL v2 node, which uses parameterized queries, is not affected.

Affected products

n8n-io n8n: before 1.123.61; from 2.0.0 before 2.27.4; 2.28.0 (and their updates) — fixed in 1.123.61, 2.27.4
n8n-io n8n: before 1.123.61 — fixed in 1.123.61

How to fix

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

References

Get alerted when CVE-2026-59257 or the next vulnerability affects your stack