Debug mode is disabled in production

Debug mode in production exposes stack traces, internal file paths, verbose application state, and detailed error messages directly to users and attackers. CWE-215 (Information Exposure Through Debug Information) and CWE-11 both describe this class of vulnerability: an attacker who can trigger an error in debug mode learns your framework version, database schema hints, and code structure — all inputs for targeted exploitation. OWASP A05 (Security Misconfiguration) lists debug-enabled production as a canonical misconfiguration. Beyond security, verbose logging inflates log costs and obscures real signals.

Ensure NODE_ENV=production is set by the hosting platform (Vercel and Netlify do this automatically) and remove any explicit debug flags from your production environment variables.

// next.config.js — disable source map exposure in production
module.exports = { productionBrowserSourceMaps: false }

Remove DEBUG=true, APP_DEBUG=true, or any framework-specific debug flags from production environment variable configuration. Set logging levels to warn or error — not debug or verbose. Verify Next.js is not serving in development mode: the build output should report info - Creating an optimized production build.