Security Check n°17 / 120

Source maps not exposed

Source maps are files (.js.map) generated during the build process that allow developer tools to remap minified/bundled code back to the ori…

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How TheSiteFuse checks "Source maps not exposed"

Source maps are files (.js.map) generated during the build process that allow developer tools to remap minified/bundled code back to the original source. They are essential for debugging in dev, but if accessible in production, they expose the full source code (comments, business logic, potentially forgotten keys in code).

Real-world impact of "Source maps not exposed"

An attacker with access to source maps can read the application source code and look for hardcoded API keys, business logic flaws, or undocumented endpoints. Source maps should be generated but not deployed in production, or protected by authentication.

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