Ni8mare Vulnerability Allows Attackers to Hijack n8n Servers, Exploit Publicly Released

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical Ni8mare Vulnerability in n8n Servers Exposes Thousands to Remote Code Execution A critical vulnerability, tracked as CVE-2026-21858, has been discovered in the n8n workflow automation platform, allowing unauthenticated attackers to execute arbitrary commands and potentially take over an estimated 100,000 servers worldwide. The flaw carries a maximum CVSS score of 10.0, and a proof-of-concept exploit has been released, putting numerous hosts at risk. 3 sources 40