A critical n8n flaw (CVE-2026-21858, CVSS 10.0), dubbed Ni8mare, allows unauthenticated attackers to fully take over vulnerable instances. Researchers uncovered a maximum severity n8n vulnerability, tracked as CVE-2026-21858 (CVSS score of 10.0). The flaw, dubbed Ni8mare by Cyera researchers who discovered the vulnerability, lets unauthenticated attackers fully compromise affected instances. n8n is a workflow automation … Continue reading Ni8mare flaw gives unauthenticated control of n8n instances