Technical writing Security issue of substantial website base system

Write a technical report detailing a systematic review of the security issues of a substantial web-based system with known vulnerabilities, reporting on proven vulnerabilities exploited by attack and potential mitigations that could be implemented (1500 words). Select three of the following vulnerabilities, review them and conduct a practical demonstration on how these vulnerabilities were identified, remediated along with the strategies followed. Finally, document all your practical work with detail screenshots of every step taken. Vulnerabilities should not be limited to the following: • String manipulation. • Buffer overflows and memory exploits. • Trojans • Backdoors. • Privilege escalation. • Injection (e.g. SQL injection) and cross-site scripting • Cross-site scripting.