The Canadian Centre for Cyber Security has issued an alert regarding multiple high-severity vulnerabilities in n8n workflow automation software. These flaws, including improper input validation and code injection, can be chained by unauthenticated attackers to achieve remote code execution, with public Proof-of-Concept exploits already available.
CVE-2026-21858
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AL26-001 – Vulnerabilities affecting n8n – CVE-2026-21858, CVE-2026-21877 and CVE-2025-68613