From this webpage screenshot, the following key vulnerability information can be obtained: Vulnerability Overview Affected Product: PHPGurukul Small CRM in PHP V4.0 Vulnerability Type: Multiple Stored Cross-Site Scripting (XSS) Vulnerabilities Affected Versions Affected Version: V4.0 Vulnerability Details Case 1: Registration Module Input Parameter: username Trigger File: admin/process/registration.php PoC: When an administrator accesses , the XSS attack is triggered. Case 2: Ticket Module Input Parameter: ticket_subject Trigger File: admin/process/ticket.php PoC: When an administrator accesses , the XSS attack is triggered. Case 3: Quote Module Input Parameter: quote Trigger File: admin/process/data/quote.php PoC: When an administrator views a specific quote record, the XSS attack is triggered. Recommended Remediation Measures 1. Input Validation - Apply appropriate input validation before inserting data into HTML content. 2. Output Encoding and Escaping - Encode and escape all user inputs for HTML, JavaScript, etc. 3. Content Security Policy (CSP) - Implement CSP to restrict sources of loadable resources and prevent XSS attacks. 4. Context-Aware Escaping - Choose appropriate escaping methods based on output context (e.g., HTML, JavaScript, etc.). 5. Security Testing and Code Review - Conduct regular security testing and code reviews to ensure code security.