n8n Users Urged to Patch CVSS 10.0 Full System Takeover Vulnerability

A critical vulnerability (CVE-2026-21877) found by Upwind affects n8n automation tools. Learn why researchers are urging users to update to version 1.121.3 immediately to prevent remote code execution.

If your company uses n8n to handle daily tasks, it is time to check your version number. A major security flaw has been found in the platform, and it’s about as serious as it gets. The firm Upwind recently put out an analysis on this problem, which is a “critical authenticated remote code execution vulnerability.”

In simple words, it means that if a hacker gets in, they could take over the whole system. For your information, n8n is a “glue” that connects different apps and databases. Because it sits in the middle of all that data, a security gap here is a massive deal.

What went wrong?

This flaw is officially named CVE-2026-21877 and carries a 10.0 severity ...