The Ni8mare vulnerability (CVE-2026-21858) impacts the popular open-source automation platform n8n, allowing attackers to gain control over server files without authentication. Researchers highlight the risks of sensitive data exposure and system compromise due to flawed data parsing logic. #Ni8mare #n8n #CVE-2026-21858
Keypoints
- The Ni8mare vulnerability affects over 100,000 n8n servers worldwide.
- It enables remote, unauthenticated attackers to execute arbitrary code and access sensitive files.
- The flaw stems from a content-type confusion in n8nās data parsing mechanism.
- n8n is extensively used for AI integration, automation, and data workflows, making the vulnerability widespread.
- The recommended mitigation is to update to version 1.121.0 or later and restrict access to webhook endpoints.