Critical Unauthenticated RCE Vulnerability in n8n (CVE-2026-21858)
In early January 2026, a critical vulnerability, CVE-2026-21858, was discovered in n8n, an open-source workflow automation platform. This flaw, dubbed 'Ni8mare,' allows unauthenticated remote code execution due to improper input validation in form-based workflows. Exploiting this vulnerability enables attackers to gain full control over affected servers, leading to potential data theft, workflow manipulation, and system compromise. ([purple-ops.io](https://www.purple-ops.io/resources-hottest-cves/cve-2026-21858-ai-exploit/?utm_source=openai)) The widespread use of n8n, with over 100 million Docker pulls and numerous internet-exposed instances, amplifies the risk. As of January 11, 2026, approximately 59,500 vulnerable hosts remain exposed, highlighting the urgency for organizations to apply the available patches promptly. ([techradar.com](https://www.techradar.com/pro/security/thousands-of-n8n-instances-under-threat-from-top-security-issue?utm_source=openai))
Kill Chain