n8n default admin password – how to change it and lock down the instance March 28, 2026 n8n Security Errors
n8n env var access denied – [error: access to env vars denied] fix March 28, 2026 n8n Security Errors
n8n public webhook no authentication – how to add basic auth or header verification March 28, 2026 n8n Security Errors
n8n JWT invalid signature error – fix for N8N_JWT_AUTH_HEADER and token misconfig March 28, 2026 n8n Security Errors
