CVE-2026-3763 identifies a cross-site scripting (XSS) vulnerability in the Simple Flight Ticket Booking System version 1.0 developed by code-projects. The vulnerability resides in an unspecified function within the showhistory.php file, which processes user input insufficiently, allowing malicious scripts to be injected and executed in the context of the victim's browser. This flaw enables remote attackers to craft URLs or input fields that, when accessed or interacted with by users, execute arbitrary JavaScript code. The vulnerability does not require any authentication or privileges, increasing its accessibility to attackers. However, user interaction is necessary to trigger the XSS payload, such as clicking a malicious link or viewing a compromised page. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:P), and limited impact on integrity (VI:L) with no impact on confidentiality or availability. No patches or official fixes have been released yet, and while the exploit code has been publicly disclosed, there are no confirmed reports of exploitation in the wild. This vulnerability could be leveraged for session hijacking, phishing, or defacement attacks, potentially undermining user trust and data integrity within the booking system.

The primary impact of CVE-2026-3763 is the potential compromise of user session integrity and the execution of malicious scripts within the context of the affected web application. Attackers can exploit this vulnerability to steal session cookies, perform actions on behalf of authenticated users, or redirect users to malicious sites. While the confidentiality and availability impacts are minimal, the integrity of user data and trust in the booking system can be significantly affected. For organizations operating the Simple Flight Ticket Booking System, this could lead to reputational damage, loss of customer confidence, and potential regulatory scrutiny if user data is compromised. The fact that no authentication is required to exploit the vulnerability increases the risk of widespread attacks, especially if the system is publicly accessible. However, the need for user interaction somewhat limits automated exploitation. The absence of patches means organizations must rely on mitigations until an official fix is available.

To mitigate CVE-2026-3763, organizations should immediately implement strict input validation and output encoding on all user-supplied data processed by showhistory.php and related components. Employing Content Security Policy (CSP) headers can help restrict the execution of unauthorized scripts. Web Application Firewalls (WAFs) should be configured to detect and block typical XSS attack patterns targeting this endpoint. Administrators should monitor web server logs for suspicious requests that may indicate exploitation attempts. User education about the risks of clicking untrusted links can reduce the likelihood of successful attacks. If feasible, isolating the booking system behind VPNs or restricting access to trusted networks can reduce exposure. Organizations should also engage with the vendor or community to obtain or develop patches and apply them promptly once available. Regular security assessments and code reviews focusing on input handling in showhistory.php are recommended to prevent similar issues.