Ni8mare flaw gives unauthenticated control of n8n instances

Security Affairs

January 7, 2026 at 9:15 PM

Overview

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.

Key Takeaways

Affected Systems: n8n workflow automation platform, all affected instances without authentication
Action Required: Users should apply any available patches from n8n, review their configurations, and consider implementing additional security measures such as restricting access to instances and monitoring for unusual activity.
Timeline: Newly disclosed

Original Article Summary

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 […]

Impact

n8n workflow automation platform, all affected instances without authentication

Exploitation Status

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

Timeline

Newly disclosed

Remediation

Users should apply any available patches from n8n, review their configurations, and consider implementing additional security measures such as restricting access to instances and monitoring for unusual 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, Critical.

Read Original Article

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