Critical n8n Vulnerability (CVSS 10.0) Allows Unauthenticated Attackers to Take Full Control

The Hacker News

January 7, 2026 at 1:48 PM

Overview

Researchers have identified a severe vulnerability in n8n, a widely-used workflow automation platform, allowing unauthenticated attackers to take full control of affected instances. This flaw, tracked as CVE-2026-21858 and given a maximum CVSS score of 10.0, has been named Ni8mare by Cyera Research Labs. The issue poses a significant risk as it could enable attackers to manipulate workflows and access sensitive data without any authentication. Users of n8n need to take this threat seriously, as the implications of such a breach could be extensive, impacting data integrity and privacy. Immediate action is recommended to safeguard systems until a patch is made available.

Key Takeaways

Affected Systems: n8n workflow automation platform, all versions vulnerable to CVE-2026-21858
Action Required: Users should look for updates from n8n to patch the vulnerability once available.
Timeline: Newly disclosed

Original Article Summary

Cybersecurity researchers have disclosed details of yet another maximum-severity security flaw in n8n, a popular workflow automation platform, that allows an unauthenticated remote attacker to gain complete control over susceptible instances. The vulnerability, tracked as CVE-2026-21858 (CVSS score: 10.0), has been codenamed Ni8mare by Cyera Research Labs. Security researcher Dor Attias has been

Impact

n8n workflow automation platform, all versions vulnerable to CVE-2026-21858

Exploitation Status

The exploitation status is currently unknown. Monitor vendor advisories and security bulletins for updates.

Timeline

Newly disclosed

Remediation

Users should look for updates from n8n to patch the vulnerability once available. In the meantime, it is advisable to restrict access to n8n instances and monitor for any unauthorized activity.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Vulnerability, Patch, and 1 more.

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