CVE-2025-65136: School Management System XSS Vulnerability

CVE-2025-65136 Overview

A reflected Cross-Site Scripting (XSS) vulnerability has been identified in manikandan580 School-management-system version 1.0. The vulnerability exists in the /studentms/admin/contact-us.php endpoint, where the pagedes POST parameter is not properly sanitized before being reflected back to users. This allows attackers to inject malicious JavaScript code that executes in the context of an authenticated user's browser session.

Critical Impact

Attackers can exploit this XSS vulnerability to steal administrator session cookies, perform actions on behalf of authenticated users, deface the application interface, or redirect users to malicious websites.

Affected Products

• manikandan580 School-management-system 1.0
• /studentms/admin/contact-us.php endpoint

Discovery Timeline

• 2026-04-14 - CVE-2025-65136 published to NVD
• 2026-04-14 - Last updated in NVD database

Technical Details for CVE-2025-65136

Vulnerability Analysis

This reflected XSS vulnerability (CWE-79) occurs when user-supplied input through the pagedes POST parameter is echoed back to the browser without adequate sanitization or encoding. The attack requires user interaction, as a victim must be tricked into submitting a specially crafted request—typically through social engineering techniques such as clicking a malicious link or submitting a crafted form.

The vulnerability is classified as reflected XSS because the malicious payload is not stored persistently on the server but is instead immediately reflected in the application's response. When exploited against an administrator, this could lead to unauthorized access to sensitive student records, administrative functions, or the ability to modify system configurations.

Root Cause

The root cause of this vulnerability is improper input validation and output encoding in the contact-us.php script. The application fails to sanitize the pagedes POST parameter before including it in the HTML response, allowing arbitrary JavaScript code to be injected and executed in the user's browser context.

Attack Vector

The attack is network-based and requires the attacker to craft a malicious HTTP POST request containing JavaScript payload in the pagedes parameter. The attacker must then convince an authenticated administrator to submit this crafted request—typically through a malicious webpage that auto-submits a hidden form targeting the vulnerable endpoint.

Once the victim's browser processes the response containing the unsanitized input, the injected JavaScript executes with the privileges of the logged-in user, potentially allowing session hijacking, credential theft, or administrative actions on behalf of the victim.

For technical exploitation details, refer to the GitHub Security Advisory.

Detection Methods for CVE-2025-65136

Indicators of Compromise

• Unusual POST requests to /studentms/admin/contact-us.php containing JavaScript code, HTML tags, or encoded script payloads in the pagedes parameter
• Web server logs showing requests with suspicious characters such as <script>, javascript:, or URL-encoded equivalents in POST data
• Reports from users about unexpected browser behavior or redirects when accessing the contact-us functionality
• Detection of session cookies being transmitted to external domains

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payload patterns in POST parameters
• Deploy browser-based Content Security Policy (CSP) headers to prevent inline script execution
• Enable detailed logging on the web server to capture full request bodies for forensic analysis
• Use security scanning tools to regularly test the application for XSS vulnerabilities

Monitoring Recommendations

• Monitor web application logs for requests containing common XSS indicators such as <script>, onerror=, onload=, and similar event handlers
• Set up alerts for unusual patterns of POST requests to administrative endpoints
• Implement real-time monitoring for Content Security Policy violation reports
• Track and investigate any anomalous session activity following visits to the contact-us page

How to Mitigate CVE-2025-65136

Immediate Actions Required

• Restrict access to the /studentms/admin/contact-us.php endpoint to trusted networks or IP addresses until a patch is available
• Implement input validation on all POST parameters, rejecting or encoding any HTML or JavaScript content
• Deploy Content Security Policy headers to prevent execution of inline scripts
• Consider temporarily disabling the contact-us functionality if it is not business-critical

Patch Information

No official vendor patch information is currently available for this vulnerability. Organizations should monitor the GitHub Security Advisory for updates and consider applying manual mitigations or implementing compensating controls until an official fix is released.

Workarounds

• Apply output encoding using PHP's htmlspecialchars() or htmlentities() functions to the pagedes parameter before rendering it in HTML responses
• Implement a Web Application Firewall with rules specifically targeting XSS payloads in POST data
• Restrict access to administrative pages using network-level controls such as IP allowlisting
• Enable HTTP-only and Secure flags on session cookies to limit the impact of potential session hijacking

# Example Apache configuration to add Content Security Policy header
# Add to .htaccess or Apache configuration file
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'"
Header set X-XSS-Protection "1; mode=block"
Header set X-Content-Type-Options "nosniff"