CVE-2024-4523: School Management System XSS Vulnerability

CVE-2024-4523 Overview

CVE-2024-4523 is a reflected cross-site scripting (XSS) vulnerability [CWE-79] in Campcodes Complete Web-Based School Management System 1.0. The flaw resides in /view/teacher_attendance_history1.php, where the year parameter is reflected into the response without proper sanitization. Attackers can craft a malicious URL that executes arbitrary JavaScript in the victim's browser session when clicked. The vulnerability is exploitable remotely over the network and requires user interaction. Public disclosure occurred alongside the assignment of VulDB identifier 263126, and proof-of-concept details are available in external repositories.

Critical Impact

Successful exploitation allows attackers to hijack authenticated sessions, steal cookies, deface pages, or redirect users to attacker-controlled infrastructure within the school management portal.

Affected Products

• Campcodes Complete Web-Based School Management System 1.0
• Deployments exposing /view/teacher_attendance_history1.php to untrusted users
• Environments where administrators or teachers can be phished into clicking crafted URLs

Discovery Timeline

• 2024-05-06 - CVE-2024-4523 published to the National Vulnerability Database (NVD)
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-4523

Vulnerability Analysis

The vulnerability is a reflected XSS issue in the teacher attendance history view. The year HTTP parameter passed to /view/teacher_attendance_history1.php is returned to the browser without HTML encoding or input validation. When a victim visits a crafted URL, the injected payload executes in the origin context of the school management application.

Exploitation requires the victim to click a malicious link, and the scope change indicates the payload can affect resources beyond the vulnerable component. Because the application handles administrative and teacher functions, successful exploitation puts session tokens, gradebook data, and administrative actions at risk.

Root Cause

The root cause is missing output encoding on user-controlled input. The application echoes the year query string parameter directly into the rendered HTML, allowing raw <script> and event-handler markup to be interpreted by the browser. No context-aware escaping or Content Security Policy is enforced to mitigate injection.

Attack Vector

An attacker crafts a URL containing a JavaScript payload in the year parameter and delivers it via phishing, forum posts, or messaging. When an authenticated user opens the link, the injected script executes with the privileges of that user session. See the GitHub XSS Vulnerability Report for the disclosed proof of concept.

No verified exploit code is republished here. Refer to the VulDB entry 263126 for additional technical context.

Detection Methods for CVE-2024-4523

Indicators of Compromise

• Web server access logs showing GET requests to /view/teacher_attendance_history1.php with year values containing <script>, onerror=, javascript:, or URL-encoded equivalents such as %3Cscript%3E.
• Referer headers originating from external domains prior to requests against the vulnerable endpoint.
• Unusual outbound requests from user browsers to attacker-controlled domains shortly after visiting the school portal.

Detection Strategies

• Deploy a Web Application Firewall (WAF) rule that inspects the year parameter for HTML tags, event handlers, and script schemes.
• Enable server-side request logging and alert on non-numeric values submitted to a parameter expected to contain a year integer.
• Correlate suspicious portal requests with subsequent authentication anomalies to identify session theft attempts.

Monitoring Recommendations

• Ingest web server and WAF logs into a centralized analytics platform for continuous review of injection attempts.
• Monitor authenticated user sessions for concurrent logins from geographically distant IPs following clicks on external links.
• Track browser Content Security Policy (CSP) violation reports if a report-only policy is deployed in front of the application.

How to Mitigate CVE-2024-4523

Immediate Actions Required

• Restrict access to /view/teacher_attendance_history1.php behind IP allow-lists or VPN until a vendor fix is applied.
• Deploy WAF signatures that block XSS payloads targeting the year parameter.
• Educate teachers and administrators about phishing links that impersonate the school portal.

Patch Information

No vendor patch or advisory has been published for Campcodes Complete Web-Based School Management System 1.0. Organizations should track the VulDB submission 329769 and the vendor's channels for remediation guidance, and consider replacing the application if updates are not forthcoming.

Workarounds

• Validate the year parameter server-side to accept only four-digit numeric values and reject all other input.
• Apply context-aware HTML encoding to all user-controlled values before rendering them in the response.
• Implement a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins.
• Set HttpOnly and Secure flags on session cookies to reduce the impact of successful script execution.

# Example nginx WAF-style rule to block suspicious year parameter values
location /view/teacher_attendance_history1.php {
    if ($arg_year ~* "(<|>|script|onerror|onload|javascript:|%3C|%3E)") {
        return 403;
    }
}