Improper Input Handling Leading to Client Side Code Execution and Backend Information Disclosure Improper Input Handling allows unsanitized user input to trigger client-side code execution while …

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A security research writeup documenting improper input handling in a web application's search functionality. The application fails to sanitize or encode user-supplied input, enabling reflected XSS, DOM-based XSS, and HTML injection. Additionally, crafted inputs expose internal backend details such as private IP addresses and execution flow. Attempts to escalate to SSRF, command injection, and SSTI were unsuccessful. Root causes include missing output encoding, unsafe DOM APIs, and lack of Content Security Policy. Recommendations include strict output encoding, server-side validation, CSP implementation, and suppressing backend details from responses.

Improper Input Handling Leading to Client Side Code Execution and Backend Information Disclosure

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