Reflected Cross-Site Scripting (XSS) Vulnerabilities on Scriptcase

I scanned the scriptcase app with Qualys Scan (Vulnerability scan management) and I see Level 5 security vulnerability: Reflected Cross-Site Scripting (XSS) Vulnerabilities How to fix these Vulnerabilities?

Reflected XSS Attack - Prevention of Non-Persistent XSS

scriptcase.de Cross Site Scripting vulnerability OBB-2923045

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