URGENT: Is Your n8n Automation a "Ni8mare"? CVSS 10.0 Vulnerability Explained! CVE-2026-21858

🚨 *URGENT: Is Your n8n Automation a "Ni8mare"? CVSS 10.0 Vulnerability Explained!* 🚨

If you use *n8n* for your workflow automation, you need to watch this right now! 🤖💻 A massive security flaw—codenamed *Ni8mare**—has been discovered, and it’s a perfect 10.0 on the severity scale. This means unauthenticated attackers could take **full control* of your server without even needing a password!

In this video, we break down the technical details of *CVE-2026-21858* and what it means for your sensitive data. 🔐

*What’s happening inside the "Ni8mare"?* 😱
*The Flaw:* A "Content-Type" confusion bug in how n8n handles webhooks and form submissions.
*The Risk:* Attackers can trick the system into reading local files (like your database or config files) instead of uploaded ones.
*The Impact:* Once they have your encryption keys and admin details, they can forge a session, gain admin access, and execute arbitrary commands (RCE).
*The "Blast Radius":* Because n8n often holds your API credentials, OAuth tokens, and database connections, a breach here is like handing over the keys to your entire digital kingdom.

*Is your version at risk?* ⚠️
The vulnerability affects all versions of n8n **prior to and including 1.65.0**. This is just one of four critical vulnerabilities disclosed in a two-week span, including "N8scape" (CVE-2025-68668).

*How to stay safe: 🛡️*
1. *Update IMMEDIATELY:* The fix was released in version **1.121.0**. Check your version and upgrade to the latest stable release (like 1.123.10 or 2.3.0).
2. *Lock it Down:* Avoid exposing your n8n instance directly to the internet if possible.
3. *Auth is Key:* Enforce authentication for all Forms and consider disabling public webhook endpoints as a temporary workaround.

Don’t let your automation become a single point of failure! Check your versions, patch your systems, and keep your workflows secure. 🛠️✨

*Stay updated on the latest cybersecurity news:*
Source: Ravie Lakshmanan, "Critical n8n Vulnerability (CVSS 10.0) Allows Unauthenticated Attackers to Take Full Control," *The Hacker News*, 7 January 2026.

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