CVE-2024-2533: Online College Event Hall Reservation XSS Flaw

CVE-2024-2533 Overview

CVE-2024-2533 is a reflected cross-site scripting (XSS) vulnerability [CWE-79] in MAGESH-K21 Online-College-Event-Hall-Reservation-System version 1.0. The flaw resides in the /admin/update-users.php script, where the id parameter is rendered without proper output encoding. An unauthenticated attacker can craft a malicious URL that, when opened by an administrator, executes attacker-controlled JavaScript in the victim's browser session. The exploit details have been published, and the vendor did not respond to disclosure attempts.

Critical Impact
Successful exploitation lets attackers hijack administrator sessions, steal authentication tokens, or perform actions on behalf of the targeted admin within the reservation system.

Affected Products

MAGESH-K21 Online-College-Event-Hall-Reservation-System 1.0
Component: /admin/update-users.php
Vendor: magesh-k21 (unresponsive to disclosure)

Discovery Timeline

2024-03-16 - CVE-2024-2533 published to NVD (VulDB identifier VDB-256970)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-2533

Vulnerability Analysis

The vulnerability is a reflected XSS flaw in the administrator interface of the Online-College-Event-Hall-Reservation-System. The update-users.php endpoint accepts an id query parameter and echoes it back into the HTML response without sanitization or contextual encoding.

An attacker who tricks an authenticated administrator into visiting a crafted URL can execute arbitrary JavaScript in the admin's browser. Because the payload runs under the admin origin, it can read session cookies, submit privileged forms, or pivot to other administrative actions. The CVSS vector indicates a scope change, meaning the injected script can affect resources beyond the initially vulnerable component.

Root Cause

The root cause is missing input validation and output encoding on the id GET parameter processed by /admin/update-users.php. User-supplied data flows directly into the rendered HTML context, satisfying the classic conditions for reflected XSS described in [CWE-79]. No Content Security Policy or HTTPOnly protections mitigate the impact.

Attack Vector

Exploitation requires an attacker to deliver a malicious link to an authenticated administrator through phishing, chat, or a third-party website. Once the admin opens the URL, the injected script executes in the context of the reservation system. No prior authentication is needed to craft the payload, but user interaction is required for delivery. Public proof-of-concept details are available in the researcher's GitHub write-up.

See the referenced advisory for the exact payload structure and reproduction steps.

Detection Methods for CVE-2024-2533

Indicators of Compromise

Web server access logs showing requests to /admin/update-users.php with id parameter values containing HTML tags such as <script>, <img>, <svg>, or event handler attributes like onerror= and onload=
URL-encoded XSS payloads targeting the id parameter, including %3Cscript%3E, %3Csvg, or javascript: schemes
Unusual Referer headers pointing to attacker-controlled domains preceding administrator sessions

Detection Strategies

Deploy Web Application Firewall (WAF) rules that inspect the id parameter on /admin/update-users.php for reflected XSS patterns and block known payload signatures
Correlate outbound requests from administrator browsers with recently visited application URLs to identify data exfiltration triggered by injected scripts
Enable browser Content Security Policy (CSP) violation reporting to surface unexpected script execution in the admin interface

Monitoring Recommendations

Alert on any HTTP 200 response from /admin/update-users.php where the response body reflects the raw id parameter contents
Monitor administrator account activity for anomalous privilege changes, user modifications, or bulk record edits following link-click events
Review email and messaging gateways for URLs targeting the vulnerable endpoint sent to staff accounts

How to Mitigate CVE-2024-2533

Immediate Actions Required

Restrict access to /admin/update-users.php to trusted IP ranges or place the admin panel behind a VPN
Deploy a WAF signature that blocks XSS metacharacters in the id query parameter
Train administrators to avoid clicking unsolicited links pointing to the reservation system
Rotate administrator session cookies and credentials if suspicious link-click activity is observed

Patch Information

No official patch is available. The vendor was contacted about this disclosure but did not respond, per the VulDB advisory. Organizations should evaluate whether continued use of MAGESH-K21 Online-College-Event-Hall-Reservation-System 1.0 is acceptable given the absence of vendor support. Track the VulDB entry for any future updates.

Workarounds

Fork the application and apply output encoding using htmlspecialchars($id, ENT_QUOTES, 'UTF-8') before rendering the id value in HTML
Add server-side input validation to reject non-numeric id values at the entry point
Configure a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
Set the HttpOnly and SameSite=Strict flags on session cookies to reduce theft impact

bash

# Example nginx configuration to block obvious XSS payloads on the vulnerable endpoint
location /admin/update-users.php {
    if ($arg_id ~* "(<|%3C)(script|svg|img|iframe)|javascript:|on[a-z]+=") {
        return 403;
    }
    add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'" always;
    add_header X-XSS-Protection "1; mode=block" always;
}