The primary aim of this chapter is to focus on Generative AI and web-based applications. Further, we address the security issues and challenges. In today's digital era, web-based applications have become indispensable tools in web engineering. From social media platforms to online banking services, the ubiquity of web-based applications shapes nearly every aspect of our daily lives. As we navigate the ever-expanding digital landscape, understanding the importance of these applications in web engineering is essential for businesses, developers, and users alike. A notable trend in 2023 was the increasing emphasis on sustainability and green computing within web engineering. Businesses sought to develop eco-friendly web-based applications by optimizing energy consumption, reducing carbon footprints, and implementing environmentally conscious development practices. Despite their widespread adoption, the deployment of web-based applications is not without challenges. The study addresses key issues, including cybersecurity threats, compatibility concerns across diverse platforms, and the complexities of ensuring smooth integration with existing systems. Additionally, the abstract acknowledges that a crucial component of web-based applications in 2023 will be the incorporation of Artificial Intelligence (AI) models. Companies use AI deliberately to improve overall functionality, automate tasks, and improve user experiences. The study emphasizes how artificial intelligence (AI) may be used to address problems in fields like cybersecurity, where sophisticated algorithms help with improved threat identification and mitigation. Identifying and mitigating these challenges is critical for ensuring sustained success and functionality of web-based applications. In our view, the importance of web-based applications in web engineering is paramount. These applications serve as the backbone of digital transformation, empowering businesses to meet the demands of an increasingly interconnected world. Address the challenges identified, our opinion emphasizes the need for a proactive approach, incorporating robust cybersecurity measures, continuous innovation, and a commitment to adaptability. By leveraging the potential of web-based applications, businesses can not only meet current demands but also position themselves strategically for the future of web engineering.