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Security Advisory: CVE-2026-21858 Accelerates Urgent Upgrade for Self-Hosted n8n Instances
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Lead: Security advisory for n8n CVE-2026-21858 forces urgent upgrade The RSS signal today is a critical security advisory for n8n: CVE-2026-21858 affects n8n versions 1.65.0 through 1.120.4 and could allow an unauthenticated attacker to read files on the underlying server when a specific pattern of form-based workflow is present. The issue was fixed in 1.121.0 and released in November 2025. Cloud tenants are being upgraded automatically, while self-hosted users must upgrade manually to 1.121.0
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