CVE-2026-54312: n8n: Microsoft SQL Node Prototype Pollution

Severity: high (CVSS 8.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-23 · updated 2026-10-26
Weakness: CWE-1321

Description

n8n is an open source workflow automation platform. Prior to 2.24.0, an authenticated user with permission to create or modify workflows could achieve global prototype pollution via the Microsoft SQL node by supplying a crafted value as the table parameter. This pollutes Object.prototype process-wide for the lifetime of the n8n server process, causing application-wide validation failures and rendering the n8n instance completely non-functional until restarted. This vulnerability is fixed in 2.24.0.

Affected products

n8n-io n8n: before 2.24.0 — fixed in 2.24.0

How to fix

Upgrade to a fixed version: n8n-io n8n 2.24.0. Check the vendor advisory for mitigations.

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-x6p3-m6h9-fx7r

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