CVE-2024-4513: School Management System XSS Vulnerability

CVE-2024-4513 Overview

CVE-2024-4513 is a reflected cross-site scripting (XSS) vulnerability in Campcodes Complete Web-Based School Management System 1.0. The flaw resides in /view/timetable_update_form.php, where the grade parameter is rendered without proper output encoding. An unauthenticated remote attacker can inject arbitrary JavaScript that executes in the victim's browser session after user interaction. The issue is tracked as VDB-263117 and maps to CWE-79: Improper Neutralization of Input During Web Page Generation. Public disclosure has occurred, and a proof-of-concept is available through the referenced GitHub report.

Critical Impact
Attackers can execute arbitrary JavaScript in the browser of any user who visits a crafted link, enabling session cookie theft, credential harvesting, and unauthorized actions within the school management application.

Affected Products

Campcodes Complete Web-Based School Management System 1.0
Component: /view/timetable_update_form.php
Vulnerable parameter: grade

Discovery Timeline

2024-05-06 - CVE-2024-4513 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-4513

Vulnerability Analysis

The application accepts the grade HTTP parameter and reflects its value back into the HTML response generated by timetable_update_form.php. Because the value is not encoded or sanitized before output, an attacker-supplied string containing HTML or JavaScript is parsed and executed by the victim's browser. The scope change indicator in the CVSS vector shows that injected code can affect content and controls beyond the vulnerable form itself, including other components loaded in the same origin. Successful exploitation requires the victim to click a crafted link or visit an attacker-controlled page that submits the payload.

Root Cause

The root cause is missing output encoding on user-controlled input in a PHP view template. The grade parameter is embedded directly into the response HTML without contextual escaping through functions such as htmlspecialchars() or htmlentities(). This is a classic instance of [CWE-79], where trust boundaries between untrusted request data and rendered markup are not enforced.

Attack Vector

Exploitation is remote and requires user interaction. An attacker constructs a URL targeting /view/timetable_update_form.php with a malicious value in the grade parameter, for example a payload that closes the current HTML context and injects a <script> block. The attacker delivers the link through phishing, forum posts, or embedded iframes. When an authenticated administrator or teacher opens the link, the injected script runs with their session privileges and can read the DOM, exfiltrate cookies not marked HttpOnly, or issue authenticated requests to sensitive endpoints. See the GitHub XSS Vulnerability Report and VulDB entry #263117 for the disclosed proof-of-concept details.

No verified exploit code is reproduced here. Refer to the public advisories for payload specifics.

Detection Methods for CVE-2024-4513

Indicators of Compromise

Web server access logs containing GET or POST requests to /view/timetable_update_form.php with grade values that include <script, onerror=, javascript:, or URL-encoded equivalents such as %3Cscript.
Outbound HTTP requests from user browsers to unfamiliar domains immediately after loading the timetable update page.
Session tokens or admin cookies appearing in referer headers or third-party analytics logs.

Detection Strategies

Deploy a web application firewall (WAF) rule that inspects the grade parameter for HTML tag characters and common XSS keywords.
Enable Content Security Policy (CSP) reporting to receive report-uri alerts when inline script execution is blocked on the timetable pages.
Correlate anomalous authenticated actions performed by administrator accounts with prior visits to timetable_update_form.php in access logs.

Monitoring Recommendations

Forward web server and WAF logs to a centralized analytics platform and alert on reflected script patterns in query strings.
Monitor for spikes in outbound requests from browser sessions of school administrators and teachers.
Track user-agent and referer anomalies on requests to the affected endpoint to identify crafted links delivered by phishing.

How to Mitigate CVE-2024-4513

Immediate Actions Required

Restrict network access to the school management application to trusted internal networks or VPN users until a fix is applied.
Apply a WAF rule that blocks requests to /view/timetable_update_form.php containing angle brackets, script keywords, or event handler attributes in the grade parameter.
Instruct administrators and staff to avoid clicking timetable-related links received by email or chat.

Patch Information

No vendor patch is listed in the NVD entry or referenced advisories at the time of publication. Consult the VulDB advisory and the vendor directly for updated remediation guidance. Custom code fixes should apply contextual output encoding to the grade parameter, for example wrapping the value with htmlspecialchars($_GET['grade'], ENT_QUOTES, 'UTF-8') before rendering.

Workarounds

Implement a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins.
Set the HttpOnly and Secure flags on session cookies to reduce token theft impact.
Add input validation on the grade parameter to accept only a small set of expected values, such as numeric grade identifiers.
Consider temporarily disabling the timetable update form if operationally feasible.

bash

# Example nginx rule blocking obvious XSS payloads on the affected endpoint
location /view/timetable_update_form.php {
    if ($args ~* "(<|%3C)script|onerror=|javascript:") {
        return 403;
    }
}