With the development of information technology, humanity is increasingly delving into the world of gadgets, cloud technology, virtual reality, and artificial intelligence. Through web applications, we receive and distribute information, including confidential. During the pandemic, most people switched to online work and study. As a result, most of the data stored on personal computers, company servers, and cloud storage needs protection from cyberattacks. The problem of cybersecurity at the moment is incredibly relevant due to the hacking of cryptocurrencies, websites of ministries, bitcoin wallets or social network accounts. It is necessary to conduct high-quality testing of developed applications to detect cyber threats, to ensure reliable protection of different information. The article states that when testing applications, it checks for vulnerabilities that could arise as a result of incorrect system setup or due to shortcomings in software products. The use of innovation is necessary to improve quality. Modern realities have become a challenge for the development of cybersecurity products. Improvement of technology requires modern companies to update their IT systems and conduct regular security audits. The research is devoted to the analysis of modern OWASP testing tools that contribute to data security, with a view to their further use. The Open Web Application Security Project is an open security project. The research revealed a list of the most dangerous vectors of attacks on Web-applications, in particular, OWASP ZAP performs analyzes the sent and received data system security scanning at the primary level, MSTG performs security testing of mobile applications iOS and Android mobile devices. The practical result of the work is to test a specially developed web-application and identify vulnerabilities of different levels of criticality.