CVE-2026-15595 in Class and Exam Timetabling System
Summary
by MITRE • 07/13/2026
A vulnerability was determined in SourceCodester Class and Exam Timetabling System 1.0. The affected element is an unknown function of the file /forsubject.php. This manipulation of the argument subject causes cross site scripting. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.
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Analysis
by VulDB Data Team • 07/13/2026
The vulnerability identified in SourceCodester Class and Exam Timetabling System 1.0 represents a critical cross-site scripting flaw that compromises the security integrity of the web application. This weakness exists within an unknown function of the /forsubject.php file, indicating a lack of proper input validation and sanitization mechanisms. The vulnerability allows attackers to inject malicious scripts through the subject parameter, which serves as the attack vector for remote exploitation. The presence of this flaw in a system designed for educational institution use poses significant risks as it could enable unauthorized access to sensitive academic data and potentially facilitate broader attacks against the organization's network infrastructure.
The technical implementation of this vulnerability stems from insufficient validation of user-supplied input within the application's processing logic. When the subject argument is manipulated through the web interface, the system fails to properly sanitize or escape the input before rendering it in the browser context. This omission creates an environment where malicious JavaScript code can be executed within the victim's browser session, potentially leading to session hijacking, data theft, or unauthorized administrative actions. The vulnerability specifically aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental web application security weakness that affects numerous applications across different domains. From an operational perspective, this flaw represents a severe threat vector as it requires no special privileges to exploit and can be initiated through standard web browser interactions.
The remote exploitability of this vulnerability significantly amplifies its potential impact within the target environment. Attackers can leverage publicly disclosed exploitation techniques to compromise user sessions without requiring physical access or specialized tools beyond standard web browsing capabilities. This characteristic places the system at risk of automated attacks that could occur continuously, potentially affecting multiple users simultaneously. The attack surface extends beyond simple script injection to include broader security implications such as credential theft through session manipulation, data exfiltration from educational records, and potential privilege escalation within the application's access control mechanisms. The vulnerability's classification under ATT&CK technique T1566 - Phishing with Social Engineering provides insight into how attackers might leverage this weakness in conjunction with social engineering campaigns to maximize their impact.
Organizations utilizing this system should immediately implement comprehensive mitigations including input validation, output encoding, and the implementation of Content Security Policy headers. The most effective immediate solution involves sanitizing all user inputs through proper escaping mechanisms before rendering them in web pages. Additionally, implementing a Web Application Firewall with XSS protection capabilities would provide an additional layer of defense against similar vulnerabilities. Regular security audits and penetration testing should be conducted to identify potential input validation gaps within the application's codebase. The system administrators should also consider implementing strict access controls and monitoring for unusual activities that might indicate exploitation attempts. Given the publicly disclosed nature of this vulnerability, organizations should prioritize patching or mitigation implementation as a high-priority security measure to prevent unauthorized access to their educational data systems.