CVE-2025-63534: Blood Bank Management System XSS Flaw

CVE-2025-63534 Overview

A cross-site scripting (XSS) vulnerability exists in the Blood Bank Management System 1.0 within the login.php component. The application fails to properly sanitize or encode user-supplied input before rendering it in response. An attacker can inject malicious JavaScript payloads into the msg and error parameters, which are then executed in the victim's browser when the page is viewed.

This reflected XSS vulnerability allows attackers to execute arbitrary JavaScript code in the context of authenticated user sessions, potentially leading to session hijacking, credential theft, or further attacks against system users.

Critical Impact

Attackers can inject malicious JavaScript through the msg and error parameters in login.php, enabling session hijacking, credential theft, and malicious actions on behalf of authenticated users.

Affected Products

• Shridharshukl Blood Bank Management System 1.0
• Blood Bank Management System login.php component

Discovery Timeline

• December 1, 2025 - CVE-2025-63534 published to NVD
• December 3, 2025 - Last updated in NVD database

Technical Details for CVE-2025-63534

Vulnerability Analysis

CVE-2025-63534 is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting (XSS). The vulnerability carries a CVSS 3.1 score of 5.4 (Medium severity) with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

The CVSS vector indicates:

• Attack Vector (AV:N): Network-accessible, requiring no local access
• Attack Complexity (AC:L): Low complexity to exploit
• Privileges Required (PR:L): Low privileges needed
• User Interaction (UI:R): Requires user interaction (clicking malicious link)
• Scope (S:C): Changed scope, can impact resources beyond the vulnerable component
• Confidentiality (C:L): Low confidentiality impact
• Integrity (I:L): Low integrity impact
• Availability (A:N): No availability impact

The EPSS (Exploit Prediction Scoring System) score is 0.031% with a percentile of 8.437, indicating a relatively low probability of exploitation in the wild.

Root Cause

The root cause of this vulnerability is the lack of proper input validation and output encoding in the login.php component. When user-supplied data is passed through the msg and error URL parameters, the application directly reflects this input in the HTML response without sanitization. This allows attackers to inject HTML and JavaScript code that executes in the victim's browser context.

The vulnerable code path accepts untrusted input from URL parameters and renders them directly into the page output, violating the principle of never trusting user-supplied data and the security best practice of encoding all output.

Attack Vector

The attack is executed over the network, requiring an attacker to craft a malicious URL containing JavaScript payloads in the msg or error parameters. When a victim clicks on this crafted link, the malicious script executes in their browser within the context of the Blood Bank Management System application.

The attack scenario typically involves:

1. An attacker constructs a URL with malicious JavaScript in the msg or error parameter
2. The attacker delivers this URL to victims through phishing emails, social engineering, or embedding in other websites
3. When the victim clicks the link, the login.php page renders the malicious payload
4. The JavaScript executes in the victim's browser, potentially stealing session cookies, capturing credentials, or performing actions on behalf of the user

Detection Methods for CVE-2025-63534

Indicators of Compromise

• Unusual URL patterns containing JavaScript code in msg or error parameters
• Web server logs showing requests to login.php with encoded script tags or JavaScript event handlers
• Suspicious outbound connections from client browsers to unknown domains after visiting the application
• Reports from users about unexpected behavior or redirects when accessing the login page

Detection Strategies

Organizations can implement the following detection strategies:

1. Web Application Firewall (WAF) Rules: Configure WAF rules to detect and block requests containing XSS payloads in URL parameters, particularly targeting the msg and error parameters
2. Log Analysis: Monitor web server access logs for requests to login.php containing suspicious patterns such as <script>, javascript:, onerror=, onload=, or URL-encoded equivalents
3. Security Information and Event Management (SIEM): Create correlation rules to alert on multiple XSS-like requests from the same source IP
4. Browser Security Headers: Monitor for attempts to bypass Content Security Policy (CSP) headers if implemented

Monitoring Recommendations

• Implement real-time log monitoring for the Blood Bank Management System web server
• Configure alerts for HTTP requests containing potential XSS patterns in query strings
• Monitor for unusual client-side behavior through browser telemetry if available
• Review access logs regularly for suspicious URL patterns targeting the login functionality
• Enable verbose logging on the application to capture full request details for forensic analysis

How to Mitigate CVE-2025-63534

Immediate Actions Required

• Implement input validation to reject requests containing suspicious characters or patterns in the msg and error parameters
• Apply output encoding (HTML entity encoding) to all user-supplied data before rendering in HTML responses
• Deploy a Web Application Firewall (WAF) with XSS protection rules to filter malicious requests
• Implement Content Security Policy (CSP) headers to restrict script execution sources
• Review and audit all other input parameters in the application for similar vulnerabilities

Patch Information

As of the last NVD update on December 3, 2025, no official vendor patch has been released for this vulnerability. Organizations using the Blood Bank Management System should monitor the official GitHub repository at https://github.com/Shridharshukl/Blood-Bank-Management-System for security updates.

In the absence of an official patch, administrators should implement the workarounds described below and consider the risk of continued use of the affected software.

Workarounds

Since no official patch is currently available, the following workarounds can help mitigate the risk:

1. Implement Server-Side Input Validation: Add server-side validation to sanitize or reject input containing potentially dangerous characters

2. Apply Output Encoding: Ensure all data rendered in HTML responses is properly encoded using appropriate encoding functions for PHP such as htmlspecialchars() or htmlentities()

3. Deploy CSP Headers: Add Content Security Policy headers to restrict inline script execution

4. Use WAF Rules: Configure WAF rules to block requests with XSS payloads

Example Apache configuration for basic CSP headers:

# Add Content-Security-Policy header to restrict script sources
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'none';"
    Header set X-Content-Type-Options "nosniff"
    Header set X-XSS-Protection "1; mode=block"
</IfModule>