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Security Checklist for Custom WordPress Plugin Development

Essential security practices for custom WordPress plugins and admin workflows.

Every custom WordPress plugin should be built with explicit security rules. Validate and sanitize input, escape output, check user capabilities, verify nonces for state-changing actions, and avoid trusting request data.

Use prepared database queries and the WordPress HTTP API instead of direct unsafe calls. Store secrets outside version control and avoid exposing sensitive settings through public REST routes.

Admin screens should be designed around roles and responsibilities. Not every administrator task belongs to every logged-in user. Capability checks should happen on every action, not only when rendering a button.

Security is also an SEO issue. Compromised WordPress sites can be deindexed, flagged, or filled with spam pages. A secure plugin protects both users and organic visibility.