Critical Vulnerability Information Vulnerability Type Stored Cross-Site Scripting (Stored XSS) Affected Product Product Name: Apartment Visitors Management System Project V1.0 Vulnerable File and Parameter Affected File: Injection Endpoint: Vulnerable Parameter: Technical Details Root Cause: - The parameter is not validated or escaped. - Content is directly injected into the HTML body, allowing execution of event handler attributes such as . - No Content Security Policy (CSP) is in place to restrict script execution. Impact Attacker Can: - Execute arbitrary code in the victim’s browser. - Steal cookies or session tokens. - Perform CSRF attacks via session hijacking. - Gain elevated privileges if an administrator views the injected content. - Expose sensitive data or redirect users to malicious websites. Vulnerability Location and Parameter File: Injection Point: (via POST request to ) Sink: HTML output (without encoding) Recommended Remediation 1. Output Encoding (Server-Side Fix: RECOMMENDED) 2. Input Validation 3. Implement Content Security Policy (CSP) 4. Use Sanitizer CVE ID CVE-2025-7827