CVE-2025-56605 in Event Management System
Summary
by MITRE • 02/26/2026
A reflected Cross-Site Scripting (XSS) vulnerability exists in the register.php backend script of PuneethReddyHC Event Management System 1.0. The mobile POST parameter is improperly validated and echoed back in the HTTP response without sanitization, allowing an attacker to inject and execute arbitrary JavaScript code in the victim's browser.
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Analysis
by VulDB Data Team • 02/26/2026
The CVE-2025-56605 vulnerability represents a critical reflected cross-site scripting flaw within the PuneethReddyHC Event Management System version 1.0, specifically targeting the register.php backend script. This vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied data before incorporating it into HTTP responses. The mobile POST parameter serves as the primary attack vector, where malicious input can be seamlessly injected into the application's response stream, creating an environment conducive to client-side exploitation. The vulnerability manifests when the application echoes the unsanitized mobile parameter value directly back to the user's browser without implementing proper output encoding or validation controls.
From a technical perspective, this reflected XSS vulnerability operates through the standard attack pattern where an attacker crafts a malicious URL containing JavaScript payload within the mobile parameter, then tricks victims into clicking the link. When the victim's browser requests the malicious URL, the server processes the mobile parameter and reflects the unsanitized input back in the HTTP response, executing the injected JavaScript code within the victim's browser context. This vulnerability directly maps to CWE-79, which defines Cross-Site Scripting as a condition where an application includes untrusted data in a new web page without proper validation or escaping, or where the application uses a client-side scripting language to incorporate untrusted data without proper sanitization. The attack follows the typical reflected XSS methodology described in the ATT&CK framework under technique T1566.001 for initial access through spearphishing attachments or links, with the specific execution occurring through the web application's vulnerable input handling mechanism.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it enables attackers to perform a wide range of malicious activities within the victim's browser context. An attacker could potentially steal user session cookies, redirect victims to malicious websites, deface the application interface, or harvest sensitive information from the victim's browser. The reflected nature of this vulnerability means that the attack payload does not need to be stored on the server, making detection more challenging for security monitoring systems. The vulnerability affects all users of the Event Management System who are tricked into clicking malicious links, potentially compromising the entire user base of the application. The lack of proper input validation in the backend script demonstrates a fundamental flaw in the application's security architecture, where the system fails to implement basic security controls such as input sanitization, output encoding, or parameter validation.
Mitigation strategies for CVE-2025-56605 should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's codebase. The primary fix involves sanitizing all user inputs, particularly the mobile parameter, by implementing proper validation techniques such as allowing only numeric characters for mobile numbers, or using appropriate encoding methods when echoing data back to users. The application should employ a whitelist approach for input validation, rejecting any input that does not conform to expected formats, and implement proper output encoding using context-appropriate escaping mechanisms. Organizations should also consider implementing Content Security Policy headers to limit the sources from which scripts can be executed, and deploy web application firewalls to detect and block malicious payloads. Additionally, regular security code reviews and penetration testing should be conducted to identify similar vulnerabilities across the entire application codebase, ensuring that all input handling mechanisms follow secure coding practices as recommended by OWASP and other industry security standards. The fix should also include implementing proper error handling that does not expose internal application details to end users, thereby reducing the attack surface for potential exploitation.