n8n Ni8mare RCE (CVE-2026-21858) Scanner

Unauthenticated remote code execution in n8n workflow automation. CVSS 10.0. Public proof-of-concept available. 24,700+ instances exposed.

Disclosed in 2026, CVE-2026-21858 affects n8n Workflow Automation and carries a CVSS score of 10.0 (CRITICAL). Despite patches being available, automated scanning continues to find unpatched systems years after initial disclosure.

1. Enter your domain in the free scanner above
2. Click "Check Now" — no signup required
3. VulnScan scans your n8n Workflow Automation installation for CVE-2026-21858 indicators
4. Results in 60 seconds — free security grade included

What is CVE-2026-21858 (n8n Ni8mare RCE)?

Unauthenticated remote code execution in n8n workflow automation. CVSS 10.0. Public proof-of-concept available. 24,700+ instances exposed.

How do I check if my website is vulnerable to CVE-2026-21858?

Enter your domain in VulnScan above. Our scanner checks for CVE-2026-21858 indicators and n8n Workflow Automation version fingerprinting. Results in 60 seconds, no signup required.

Is CVE-2026-21858 still actively exploited?

Yes. Automated exploit kits continue targeting unpatched n8n Workflow Automation systems worldwide. The CVSS score of 10.0 reflects the severity of exploitation. Patch immediately and verify with an external scan.

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