  Conventional security solutions are insufficient to address the urgent
cybersecurity challenge posed by insider attacks. While a great deal of
research has been done in this area, our systematic literature analysis
attempts to give readers a thorough grasp of penetration testing's role in
reducing insider risks. We aim to arrange and integrate the body of knowledge
on insider threat prevention by using a grounded theory approach for a thorough
literature review. This analysis classifies and evaluates the approaches used
in penetration testing today, including how well they uncover and mitigate
insider threats and how well they work in tandem with other security
procedures. Additionally, we look at how penetration testing is used in
different industries, present case studies with real-world implementations, and
discuss the obstacles and constraints that businesses must overcome. This study
aims to improve the knowledge of penetration testing as a critical part of
insider threat defense, helping to create more comprehensive and successful
security policies.
