Free Source Map Exposure Scanner
Exposed source maps let anyone read your original, unminified source code, including business logic, API endpoints, and internal comments. SaaSalyst checks up to 5 of your JavaScript bundles for publicly accessible .map files by probing for [script].map URLs. If source maps are exposed, attackers can reverse-engineer your application and find vulnerabilities faster.
Scan for exposed source maps freeWhy This Matters
Exposed source maps let anyone read your original, unminified source code, including business logic, API endpoints, and internal comments. Build systems generate source maps by default, and they often deploy to production without review. This is a low-effort, high-impact vulnerability.
40%
Higher secret exposure in repos using AI coding assistants
GitGuardian 2025 Report
400+
Exposed secrets found across 5,600 vibe-coded apps
Escape.tech
What We Find
- JavaScript .map files publicly accessible in production, leaving source code readable by anyone
- Build system generates source maps by default and they get deployed without review
- CDN caching source maps even after they're removed from the origin server
- Source maps removed from HTML but still accessible via direct URL
Checks We Run
How to Fix It
The fastest way to identify your specific gaps is to run a full SaaSalyst scan of your site. The free scan takes 30 seconds and shows you exactly which of the 118 business readiness signals need attention. No signup required.
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Frequently Asked Questions
What are source maps and why are they dangerous?
Source maps (.map files) map minified JavaScript back to your original source code. In development, they enable debugging. In production, they let anyone read your business logic, API routes, internal comments, and potentially hardcoded secrets. SaaSalyst checks up to 5 JS bundles for publicly accessible .map files.
How do I disable source maps in production?
In Next.js: set productionBrowserSourceMaps: false in next.config.js (it's false by default). In Vite/CRA: set build.sourcemap to false in your config. Always verify by checking if [your-js-bundle].map URLs return 404 in production.
Are exposed source maps a common vulnerability?
Yes. Many build tools generate source maps by default, and deployment pipelines often don't strip them. Combined with AI coding assistants (40% higher secret exposure per GitGuardian), source maps can expose secrets that were accidentally included in your source code.
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References & Official Sources
Official regulatory and standards sources relevant to the checks SaaSalyst runs on your site.
- OWASP Top 10· OWASP
- Security Headers Reference· Mozilla
- HSTS Preload List· Google
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