A web application penetration test identifies vulnerabilities in web applications that could be exploited by cybercriminals. By simulating real-world attacks, businesses can fix any vulnerabilities before they become a problem.For example, for a website with an authentication system that uses email and password, a hacker may use brute force to try different passwords until they gain access. A penetration tester will identify this vulnerability and suggest a fix such as changing the authentication system to use stronger passwords or using two-factor authentication.