Security Affairs
A serious vulnerability in n8n, known as Ni8mare (CVE-2026-21858), has been identified, allowing attackers to gain full control over affected instances without any authentication. This flaw has a maximum severity score of 10.0, indicating a high level of risk for users. Researchers from Cyera discovered this vulnerability, raising concerns about the security of workflow automation processes that many organizations rely on. If exploited, this could lead to unauthorized access, data breaches, and significant operational disruptions. Users and companies utilizing n8n should take immediate steps to secure their systems to prevent potential exploitation.