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CVE-2026-21858 aka Ni8mare: Critical Unauthenticated Remote Code Execution Vulnerability in n8n Platform

The surge of critical vulnerabilities shows no signs of slowing as 2026 begins. In the aftermath of the MongoBleed (CVE-2025-14847) disclosure, another critical flaw has surfaced, impacting the n8n AI workflow automation platform. Tracked as CVE-2026-21858 and dubbed Ni8mare, the flaw obtains a maximum-severity score (CVSS 10.0) and might result in granting full control over…