Cyber-attacks are becoming increasingly frequent, causing a lot of damage. Cyber-attacks have crippled our economic infrastructure both directly and indirectly. Attackers steal our valuable data by compromising web application security loopholes. Developers can prevent cyber-attacks using latest web technologies. Since web technologies are becoming more secure, cyber attackers are getting more incursive to find out the zero day vulnerability of the targeted system to breach the security. Nowadays most damaging attacks are done using zero-day vulnerability. An Ajax template injection is such an attack: An unauthenticated attacker dumps database table credentials by intercepting server response. Owing to the damage caused by an Ajax template injection, it can be counted among the OWASP top ten web application vulnerabilities in the near future. This paper discusses the idea of an Ajax template injection and its impact on Ajaxbased web applications. This paper also provides statistical data about the percentage of Ajax-based web application vulnerabilities in Bangladesh.