Source map exposure occurs when production builds include source maps, allowing anyone to view your original, unminified source code.
Scan for This VulnerabilitySource maps are debugging files that map minified code back to original source. While useful in development, exposing them in production reveals your entire codebase, including business logic, API endpoints, internal comments, and potentially secrets that weren't properly removed.
Business logic exposed to competitors
Internal API endpoints revealed
Comments and documentation visible
Potential secrets found in code
Easier vulnerability discovery for attackers
Configure your build to not generate source maps.
// next.config.js
module.exports = {
productionBrowserSourceMaps: false,
}
// vite.config.js
export default {
build: {
sourcemap: false,
},
}Delete any .map files from your production deployment.
Add rules to prevent source map access even if uploaded.
# _headers (Netlify) or similar
/*.map
X-Robots-Tag: noindex
# Or return 404 for .map filesVAS automatically scans for source map exposure and provides detailed remediation guidance.
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